Fix problem with infinite running python-cli

[tamarinvs19]

Description

Now python-cli process will be closed after test generation.

There was a problem with opened sockets for coverage collection.

How to test

Manual tests

1. Run python-cli
2. Expected: process closed after test generation (after the last message Finished test generation for the following functions: ...)

Self-check list

Check off the item if the statement is true. Hint: [x] is a marked item.

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• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[viktoriia-fomina]

LGTM