Remove stubbing from Gitlab::GitalyClient::Commit specs
Remove stubbing from Gitlab::GitalyClient::Commit specs

Closes gitaly#198

mmkassem/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,dplarson/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,iiet/iiet-git,iiet/iiet-git,dplarson/gitlabhq,dreampet/gitlab