* add separate run function for each test class to simplify and deduplicate generated code
* move the code that process IGNORE_BACKEND directive to the separate function, outside of generated code.
** it reduces size and complexity of a generated code
** it allows to mute and unmute tests w/o regenerate tests
* add an ability to generate IGNORE_BACKEND directive automatically, it's disabled by default
* add an ability to remove IGNORE_BACKEND directive automatically, it's enabled by default
* remove whitelists
Zalim Bashorov
a63b2e1bbd