Fix group members method for project import/export
Fix group members method for project import/export

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

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