Add mechanism to collect logs from test code

[BartoszCiesla]

Add mechanism which collect logs from test code and store logs for each
test case separately and in case of test failures dump to stderr.
Mechanism collects all logs generated by log / tracing macros.

[coveralls]

Pull Request Test Coverage Report for Build 10872489477

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 75.394%

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Files with Coverage Reduction	New Missed Lines	%
server/src/tcp/tcp_listener.rs	1	77.27%

Totals
Change from base Build 10836026942:	0.3%
Covered Lines:	23900
Relevant Lines:	31700

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💛 - Coveralls