Fix broken spec in git_push_service_spec by stubbing an external issue tracker
Fix broken spec in git_push_service_spec by stubbing an external issue tracker

dreampet/gitlab,mmkassem/gitlabhq,shinexiao/gitlabhq,darkrasid/gitlabhq,icedwater/gitlabhq,icedwater/gitlabhq,htve/GitlabForChinese,daiyu/gitlab-zh,shinexiao/gitlabhq,mr-dxdy/gitlabhq,dreampet/gitlab,daiyu/gitlab-zh,LUMC/gitlabhq,dplarson/gitlabhq,allysonbarros/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,openwide-java/gitlabhq,daiyu/gitlab-zh,iiet/iiet-git,openwide-java/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,openwide-java/gitlabhq,SVArago/gitlabhq,shinexiao/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,martijnvermaat/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,allysonbarros/gitlabhq,daiyu/gitlab-zh,dplarson/gitlabhq,dplarson/gitlabhq,openwide-java/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,htve/GitlabForChinese,allysonbarros/gitlabhq,screenpages/gitlabhq,icedwater/gitlabhq,jirutka/gitlabhq,martijnvermaat/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,jirutka/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,SVArago/gitlabhq,jirutka/gitlabhq,shinexiao/gitlabhq,martijnvermaat/gitlabhq,mmkassem/gitlabhq,screenpages/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,iiet/iiet-git,martijnvermaat/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,allysonbarros/gitlabhq,SVArago/gitlabhq,mr-dxdy/gitlabhq,screenpages/gitlabhq,axilleas/gitlabhq,screenpages/gitlabhq,axilleas/gitlabhq,mr-dxdy/gitlabhq,dplarson/gitlabhq,SVArago/gitlabhq,icedwater/gitlabhq,dreampet/gitlab