DRY group creation code in nested groups fixtures
DRY group creation code in nested groups fixtures

Signed-off-by: Dmitriy Zaporozhets <be23d75b156792e5acab51b196a2deb155d35d6a@gmail.com>

mmkassem/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,dreampet/gitlab,iiet/iiet-git,iiet/iiet-git,dreampet/gitlab,stoplightio/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,jirutka/gitlabhq