Apply pattern to make `find_or_create` atomic
Apply pattern to make `find_or_create` atomic

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