[AIRFLOW-4127] _get_instance_view returns instance view

[Trollgeir]

Jira

https://issues.apache.org/jira/browse/AIRFLOW-4127

Description

Simple bugfix for method _get_instance_view that returned current_view instead of an instance_view

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

Code Quality

• Passes flake8

[XD-DENG]

Thank you @Trollgeir . LGTM. Will merge once CI pass (I have re-triggered two failing ones to see if they're transient failure)

[codecov-io]

Codecov Report

Merging #4945 into master will increase coverage by 0.23%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4945      +/-   ##
==========================================
+ Coverage   75.58%   75.82%   +0.23%     
==========================================
  Files         454      454              
  Lines       29197    30004     +807     
==========================================
+ Hits        22069    22750     +681     
- Misses       7128     7254     +126

Impacted Files	Coverage Δ
...low/contrib/hooks/azure_container_instance_hook.py	75% <0%> (ø)	⬆️
airflow/utils/decorators.py	84.48% <0%> (-7.19%)	⬇️
airflow/contrib/executors/kubernetes_executor.py	64.58% <0%> (-0.65%)	⬇️
airflow/contrib/operators/gcp_vision_operator.py	100% <0%> (ø)	⬆️
airflow/contrib/example_dags/example_gcp_vision.py	0% <0%> (ø)	⬆️
airflow/contrib/hooks/aws_glue_catalog_hook.py	100% <0%> (ø)	⬆️
airflow/models/__init__.py	92.95% <0%> (+0.1%)	⬆️
airflow/contrib/hooks/gcp_api_base_hook.py	82.06% <0%> (+1.11%)	⬆️
airflow/utils/helpers.py	85.47% <0%> (+2.59%)	⬆️
airflow/jobs.py	79.76% <0%> (+2.88%)	⬆️
... and 2 more

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