Extend spec tests for deploy_key can_push
Extend spec tests for deploy_key can_push

Copied from the v4 tests: https://gitlab.com/gitlab-org/gitlab-ce/blob/v9.2.0/spec/requests/api/deploy_keys_spec.rb#L110-116

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