pylint: remove long-line suppressions on imports

Summary:
Per suggestion of @nfelt on #2967. We don’t use Pylint for line length,
and Google style says that imports are exempt from line length limits,
anyway.

Generated with:

```
git ls-files -z '*.py' |
    xargs -0 sed -i -e '/from.*import/s@ *# pylint: disable=line-too-long$@@'
```

Test Plan:
Our standard lint still passes:

```
$ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
0
```

wchargin-branch: unsuppress-long-imports

Author: wchargin

tensorboard/backend/application.py

@@ -48,9 +48,9 @@
 from tensorboard.backend import path_prefix
 from tensorboard.backend import security_validator
 from tensorboard.backend.event_processing import db_import_multiplexer
-from tensorboard.backend.event_processing import data_provider as event_data_provider  # pylint: disable=line-too-long
-from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator  # pylint: disable=line-too-long
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import data_provider as event_data_provider
+from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 from tensorboard.plugins.audio import metadata as audio_metadata
 from tensorboard.plugins.core import core_plugin

tensorboard/backend/application_test.py

@@ -44,7 +44,7 @@
 from tensorboard import plugin_util
 from tensorboard import test as tb_test
 from tensorboard.backend import application
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 
 

tensorboard/backend/event_processing/plugin_event_multiplexer.py

@@ -25,7 +25,7 @@
 from six.moves import queue, xrange  # pylint: disable=redefined-builtin
 
 from tensorboard.backend.event_processing import directory_watcher
-from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator
 from tensorboard.backend.event_processing import io_wrapper
 from tensorboard.util import tb_logging
 

tensorboard/backend/event_processing/plugin_event_multiplexer_test.py

@@ -23,8 +23,8 @@
 
 import tensorflow as tf
 
-from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator  # pylint: disable=line-too-long
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_accumulator as event_accumulator
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.util import test_util
 
 

tensorboard/plugins/audio/audio_plugin_test.py

@@ -32,7 +32,7 @@
 from werkzeug import wrappers
 
 from tensorboard.backend import application
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 from tensorboard.plugins.audio import audio_plugin
 from tensorboard.plugins.audio import summary

tensorboard/plugins/core/core_plugin_test.py

@@ -33,7 +33,7 @@
 from werkzeug import wrappers
 
 from tensorboard.backend import application
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.compat.proto import graph_pb2
 from tensorboard.compat.proto import meta_graph_pb2
 from tensorboard.plugins import base_plugin

tensorboard/plugins/custom_scalar/custom_scalars_plugin_test.py

@@ -25,7 +25,7 @@
 import tensorflow as tf
 
 from google.protobuf import json_format
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 from tensorboard.plugins.custom_scalar import custom_scalars_plugin
 from tensorboard.plugins.custom_scalar import layout_pb2

tensorboard/plugins/custom_scalar/summary_test.py

@@ -22,7 +22,7 @@
 import numpy as np
 import tensorflow as tf
 
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins.custom_scalar import layout_pb2
 from tensorboard.plugins.custom_scalar import metadata
 from tensorboard.plugins.custom_scalar import summary

tensorboard/plugins/debugger/debugger_plugin_test.py

@@ -23,7 +23,7 @@
 
 import tensorflow as tf
 
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 from tensorboard.plugins.debugger import debugger_plugin_testlib
 from tensorboard.plugins.debugger import numerics_alert

tensorboard/plugins/debugger/debugger_plugin_testlib.py

@@ -36,7 +36,7 @@
 
 from google.protobuf import json_format
 from tensorboard.backend import application
-from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer  # pylint: disable=line-too-long
+from tensorboard.backend.event_processing import plugin_event_multiplexer as event_multiplexer
 from tensorboard.plugins import base_plugin
 from tensorboard.plugins.debugger import constants
 from tensorflow.core.debug import debugger_event_metadata_pb2