Adds admin check on groupname changes.
Adds admin check on groupname changes.

michaelletzgus/nextcloud-server,bluelml/core,cernbox/core,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,cernbox/core,whitekiba/server,owncloud/core,owncloud/core,jbicha/server,pmattern/server,Ardinis/server,xx621998xx/server,cernbox/core,bluelml/core,endsguy/server,jbicha/server,endsguy/server,pixelipo/server,pmattern/server,xx621998xx/server,pixelipo/server,michaelletzgus/nextcloud-server,bluelml/core,pmattern/server,pollopolea/core,whitekiba/server,pollopolea/core,endsguy/server,andreas-p/nextcloud-server,lrytz/core,lrytz/core,sharidas/core,sharidas/core,andreas-p/nextcloud-server,nextcloud/server,IljaN/core,endsguy/server,whitekiba/server,pixelipo/server,cernbox/core,xx621998xx/server,sharidas/core,Ardinis/server,pmattern/server,pollopolea/core,owncloud/core,IljaN/core,whitekiba/server,owncloud/core,sharidas/core,sharidas/core,andreas-p/nextcloud-server,jbicha/server,whitekiba/server,xx621998xx/server,owncloud/core,Ardinis/server,Ardinis/server,nextcloud/server,phil-davis/core,IljaN/core,andreas-p/nextcloud-server,IljaN/core,cernbox/core,lrytz/core,IljaN/core,pollopolea/core,bluelml/core,xx621998xx/server,jbicha/server,pmattern/server,endsguy/server,Ardinis/server,nextcloud/server,andreas-p/nextcloud-server,pollopolea/core,bluelml/core,pixelipo/server,nextcloud/server,pixelipo/server,lrytz/core,jbicha/server,lrytz/core