Tests: minor fixes.

Fixing isolated process PID manipulation.

Registering an isolated PID in the global PID hash is wrong
because it can be duplicated. Isolated processes are stored only
in the children list until the

Fixing isolated process PID manipulation.

Registering an isolated PID in the global PID hash is wrong
because it can be duplicated. Isolated processes are stored only
in the children list until the response for the WHOAMI message is
processed and the global PID is discovered.

To remove isolated siblings, a pointer to the children list is
introduced in the nxt_process_init_t struct.

This closes #633 issue on GitHub.

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Tests: added flags to search functions in proto.py.

Also removed unnesessary re.compile() calls.

Tests: minor improvements.

Added "go" availability check before trying to build an application.

update_action() method used were possible and fixed bug with
the relative path determination in test_

Tests: minor improvements.

Added "go" availability check before trying to build an application.

update_action() method used were possible and fixed bug with
the relative path determination in test_static_chroot.py.

Templates optimization and style fixes.

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Tests: added more tests with reconfiguration.

Tests: style.

Tests: added test with long certificate chain.

Tests: removed TestApplicationTLS.get_server_certificate().

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

Tests: refactored working with processes.

Tests: app prototype related fixes.

Tests: style.

Fixing multiple TLS-enabled listeners initialization.

Because of the incorrect 'last' field assignment, multiple listeners with
a TLS certificate did not initialize properly, which caused a router c

Fixing multiple TLS-enabled listeners initialization.

Because of the incorrect 'last' field assignment, multiple listeners with
a TLS certificate did not initialize properly, which caused a router crash
while establishing a connection.

Test with multiple TLS listeners added.

The issue was introduced in the c548e46fe516 commit.

This closes #561 issue on GitHub.

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Tests: added TLS test without close notify.

Tests: added test for TLS with IP in SAN.

Tests: added test for TLS with empty Subject field.

Tests: preserving unit.log when run without restart.

Introducing "unit.log.Log" class for "unit.log" file management.
Moving "findall()" function into TestApplicationProto.
Using "os.kill()" to send

Tests: preserving unit.log when run without restart.

Introducing "unit.log.Log" class for "unit.log" file management.
Moving "findall()" function into TestApplicationProto.
Using "os.kill()" to send signals.

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Tests: style.

Tests: added "--restart" option.

Now Unit do not restart after each test by default.

Tests: added missing checks for configuration results.

Tests: style.

Tests: skip_alert() converted to the fixture.

Tests: options moved to the separate class.

This change is necessary to separate the logic
and prevent possible circular dependency.

Tests: fixing tests interrupt in terminal.

KeyboardInterrupt re-raised.

Tests: fixed unit.log print.

Tests: minor fixes.