improve token security
improve token security

switched from time() to internal method OC_Util::generate_random_bytes()

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