set default value for instance_name
align arguments
rewrite tests' configs collection
get rid of unused instance variables
rewrite collect_instances_params
Merge branch 'refactor' into develop
fix: undone d8f5a974f59ce6ebaead3922d2ed566c7adb3944
Merge branch 'develop' into hotfixes
Merge branch 'hotfixes' into develop
shorten invocation chains
remove redundant key access
add tests' configs dir parameter
tests: different_versions tests can be used now for any elliptics versions
Merge branch 'refactoring/runtests' of https://github.com/itIGO/elliptics-qa into itIGO-refactoring/runtests
Merge branch 'itIGO-refactoring/runtests' into develop
Merge branch 'develop' into refactor