Bug fixes: logout

[lizhming]

Motivation and context

How has this been tested?

Checklist

• 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
• 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

• 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.
• I have updated the license header for each file (see an example below)

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

Resolve #1810

[coveralls]

Pull Request Test Coverage Report for Build 6254

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 65.158%

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Totals
Change from base Build 6253:	0.04%
Covered Lines:	11049
Relevant Lines:	16548

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💛 - Coveralls

[ActiveChooN]

@lizhming, thanks a lot, could you just add changes to changelog?

[bsekachev]

@lizhming

Hi, thanks for the PR. Please, fill out checkboxes in PR description. We aren't permitted to merge it without some of them.

Also need to update a version of cvat-ui using command npm version patch in cvat-ui directory.

[nmanovic]

@lizhming , thanks for the PR. Great to see such contributions.