imports: Remove unused imports

The linter now understands our imports (yay), and complains a lot (boo):
* Remove really unused imports
* disable lints for tuf.log and securesystemslib imports: these imports
  have logging side-effects (they set default loggers for tuf and
  securesystemslib respectively) and I'm cautious about just removing
  them

Signed-off-by: Jussi Kukkonen <jkukkonen@vmware.com>

tuf/client/updater.py

@@ -144,7 +144,7 @@
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb
-from tuf import log
+from tuf import log # pylint: disable=unused-import
 from tuf import mirrors
 from tuf import roledb
 from tuf import settings

tuf/developer_tool.py

@@ -40,21 +40,19 @@
 import six
 
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib import storage as sslib_storage
 from securesystemslib import util as sslib_util
 
-import tuf
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb
-from tuf import log
+from tuf import log # pylint: disable=unused-import
 from tuf import repository_lib as repo_lib
 from tuf import roledb
 from tuf import sig
-import tuf.repository_tool
 
 from tuf.repository_tool import Targets
 from tuf.repository_lib import _check_role_keys

tuf/download.py

@@ -39,7 +39,7 @@
 import six
 from urllib3.exceptions import ReadTimeoutError
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import formats as sslib_formats
 
 import tuf

tuf/keydb.py

@@ -44,7 +44,7 @@
 import logging
 import copy
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib import keys as sslib_keys

tuf/log.py

@@ -75,7 +75,6 @@
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 
-import tuf
 from tuf import exceptions
 from tuf import settings
 

tuf/mirrors.py

@@ -32,12 +32,11 @@
 
 import os
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib.util import file_in_confined_directories
 
-import tuf
 from tuf import formats
 
 import six

tuf/repository_lib.py

@@ -40,7 +40,7 @@
 import six
 import tempfile
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib import hash as sslib_hash
@@ -49,7 +49,6 @@
 from securesystemslib import util as sslib_util
 from securesystemslib import storage as sslib_storage
 
-import tuf
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb

tuf/repository_tool.py

@@ -48,7 +48,6 @@
 from securesystemslib import util as sslib_util
 from securesystemslib import storage as sslib_storage
 
-import tuf
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb

tuf/roledb.py

@@ -52,14 +52,12 @@
 import logging
 import copy
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 
-import tuf
 from tuf import exceptions
 from tuf import formats
-from tuf import log
 
 import six
 

tuf/scripts/client.py

@@ -71,7 +71,6 @@
 import argparse
 import logging
 
-import tuf
 from tuf import exceptions
 from tuf import log
 from tuf import settings

tuf/scripts/repo.py

@@ -150,15 +150,14 @@
 
 # 'pip install securesystemslib[crypto,pynacl]' is required for the CLI,
 # which installs the cryptography and pynacl.
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib import interface as sslib_interface
 from securesystemslib import keys as sslib_keys
 from securesystemslib import settings as sslib_settings
 from securesystemslib import util as sslib_util
 
-import tuf
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb

tuf/sig.py

@@ -50,12 +50,11 @@
 
 import logging
 
-import securesystemslib
+import securesystemslib # pylint: disable=unused-import
 from securesystemslib import exceptions as sslib_exceptions
 from securesystemslib import formats as sslib_formats
 from securesystemslib import keys as sslib_keys
 
-import tuf
 from tuf import exceptions
 from tuf import formats
 from tuf import keydb