Tests: get rid of classes in test files.

Class usage came from the unittest framework and it was always redundant
after migration to the pytest. This commit removes classes from files
containing te

Tests: get rid of classes in test files.

Class usage came from the unittest framework and it was always redundant
after migration to the pytest. This commit removes classes from files
containing tests to make them more readable and understandable.

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Tests: prerequisites checking reworked.

Prerequisites check moved to the module level to simplify class structure.
Discovery and prerequisites checks functions moved to the separate files.
Introduce

Tests: prerequisites checking reworked.

Prerequisites check moved to the module level to simplify class structure.
Discovery and prerequisites checks functions moved to the separate files.
Introduced "require" fixture to provide per-test requirements check.

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Tests: more fixtures.

Common methods from applications/proto.py converted to the fixtures.
sysctl check moved to the specific file where it is using.
Some options moved to the constructor to have ea

Tests: more fixtures.

Common methods from applications/proto.py converted to the fixtures.
sysctl check moved to the specific file where it is using.
Some options moved to the constructor to have early access.

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Tests: unified setup method usage.

To make fixtures accessible inside of setup methods in tests all these methods
are renamed to the "setup_method_fixture" and decorated by autouse flag.

Also all s

Tests: unified setup method usage.

To make fixtures accessible inside of setup methods in tests all these methods
are renamed to the "setup_method_fixture" and decorated by autouse flag.

Also all setup methods moved to the top of the files.

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Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported

Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.

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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: style.

Tests: refactored working with processes.

Tests: removed unused imports.

Tests: style.

Tests: added SNI test without hostname in request.

Tests: style.

Tests: SNI.