updated auto annotation runner to use new auto annotation api

[benhoff]

Motivation and context

See: #1798
Note that the API was changed in 8a2efa4 to not continually add to a list. Users were reporting issues with large video files consuming all the RAM, so we went to a more iterative API.

How has this been tested?

Sorry, I don't have an active CVAT installation. This was not tested.

Checklist

• [ x ] I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• [x ] I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• [ x ] I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• [x ] I have updated the license header for each file (see an example below)

# Copyright (C) 2020 Intel Corporation
#
# SPDX-License-Identifier: MIT

[coveralls]

Pull Request Test Coverage Report for Build 6278

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.009%) to 65.154%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cvat/apps/auto_annotation/inference.py	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
cvat/apps/engine/media_extractors.py	2	77.06%

Totals
Change from base Build 6272:	-0.009%
Covered Lines:	11048
Relevant Lines:	16548

---

💛 - Coveralls

[nmanovic]

 @benhoff , could you please look at #1767 and give your opinion?

[benhoff]

Tested locally, there is one person who reports an error running the code in the original issue (following up with that person currently), so might be worth testing on before pulling.

[benhoff]

@nmanovic , let me take a look tomorrow.

[azhavoro]

@benhoff Hi, thanks for the PR, regarding the issue with TypeError: argument of type 'NoneType' is not iterable I suppose this line
(https://github.com/benhoff/cvat/blob/runfile/cvat/apps/auto_annotation/inference.py#L153) should be changed like this:

label_attr_spec = self.attribute_spec.get(db_label, dict())

[nmanovic]

@benhoff , thanks for all your contributions. I will close the PR because soon the updated files will be removed.