Added testcases about adding and removing users to groups using subadmins
Added testcases about adding and removing users to groups using subadmins

sharidas/core,owncloud/core,owncloud/core,sharidas/core,sharidas/core,pollopolea/core,owncloud/core,pollopolea/core,IljaN/core,IljaN/core,IljaN/core,sharidas/core,pollopolea/core,phil-davis/core,pollopolea/core,owncloud/core,IljaN/core,sharidas/core,IljaN/core,owncloud/core,pollopolea/core