This commit replaces stub plugins with the shared ones from utils
module.
This also removes separate tests for checking python and lua
dependencies. This is now tested in the 'default' test thanks to
`pluginChecks` code.
This commit finalizes using shared utils stub plugins for
performance.byteCompileLua tests.
To re-use more code from utils module, 'pluginChecksFor', 'libChecksFor'
and 'pythonChecksFor' functions were introduced. These functions
generate a check code for the given plugins/libs names.
This commit introduces a shared utils module for future use in
performance tests. It includes lua libraries and plugins of various
types and dependencies. Additionally, it provides lua code snippets to
verify that all features supplied by the plugins are functioning
correctly.
