Var: improved variable parsing with empty names.

Unit parsed the case of "$uri$$host" into unknown variables.
This commit makes it invalid variable instead.

Tests: fixed assertion in test_variables_dynamic.

Tests: added tests for the $request_time variable.

Tests: reworked "test_variables.py".

Access log used for the variables testing instead of limited routing.
Added missed test for $status variable.
Some tests moved from "test_access_log.py" to "test

Tests: reworked "test_variables.py".

Access log used for the variables testing instead of limited routing.
Added missed test for $status variable.
Some tests moved from "test_access_log.py" to "test_variables.py".

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Tests: added tests for translating $dollar into a literal $.

If you need to specify a $ in a URI you can now use '$dollar' or
'${dollar}'.

Added some tests for the above to test_variables.py settin

Tests: added tests for translating $dollar into a literal $.

If you need to specify a $ in a URI you can now use '$dollar' or
'${dollar}'.

Added some tests for the above to test_variables.py setting a Location
string.

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Tests: added tests for more HTTP variables.

Tests: added tests for dynamic variables.

Tests: improved test for $request_uri variable.

Tests: Added tests for $request_uri.

Tests: removed TestApplicationTLS.get_server_certificate().

distutils.version is replaced by packaging.version. Also minor style fixes.

Router: fixed segmentation fault.

In the case that routes or upstreams is empty and the pass option is a variable.
If the resolved pass is routes or upstreams, a segment error occurred.

Tests: style.

Tests: fixed unit.log print.

Tests: added variable test with nonexistent upstream.

Tests: migrated to the pytest.

Tests: $host varaible test.

Also added few tests for $uri and minor style fixes.

Tests: added variables tests.