Enforce Import Ordering (Isort)

[Vijay-P]

What this PR does / why we need it:
This PR utilizes isort to enforce import ordering across all modules that follows python best practices.

• Added isort configuration file
• changed make lint shell script to check import ordering
• Ran isort on all modules
• added isort commit to .git-blame-ignore-revs
• Added pylint ignore comments to lines that could not be fixed
• Fix circular import in anchore_engine/subsys/object_store/manager.py

Which issue this PR fixes (optional, in fixes #<issue number>)(, fixes #<issue_number, ...) format, will close the issue when PR is merged: fixes #:

Special notes:

[Toure]

It looks good, a great clean-up. Just have to run some test tomorrow and I think it should be good to go.

[Toure]

The following test looks good.

1. Deployment
2. Image add
3. listing images
4. Vuln listing for images
5. Feeds sync'd (non-vunldb)
6. removing an image

[dspalmer99]

@Vijay-P Is there a way (I am assuming there is) to add an isort plugin to pycharm (and vscode) to run automatically on every save? If so, can you add it to the README?

[dspalmer99]

The engineering repo might be a better place for it, but it should be documented somewhere.
Otherwise this LGTM

[Vijay-P]

@Vijay-P Is there a way (I am assuming there is) to add an isort plugin to pycharm (and vscode) to run automatically on every save? If so, can you add it to the README?

yes, absolutely

[Vijay-P]

The engineering repo might be a better place for it, but it should be documented somewhere.
Otherwise this LGTM

https://github.com/anchore/engineering/pull/21