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[MRG+1] Automatic port selection for servicies in unit tests (#3210)

* ability to pass port as a parameter

* try to find free ports

* use environment variables to pass mock server address

* get mock server address from environment variables

* ability to select ports for proxy in runtime

* use common method for URLs from mock server

* https support

* get mock server address

* get mock address

* replace hand-written mechanism by kernel-based one

* use ephemeral ports in mockserver

* strip EOL from addresses

* use ephemeral port in proxy

* no need to restore environment as it is restored in tearDown

* decode bytes

* use mockserver address as a variable

* ability to pass address as variable

* per test-case mockserver

* use base class

* remove obsolete environment manipulation

* return usage of proxy for http cases

* common method for broking proxy auth credentials

* python version-independent url methods

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