Fix intergrity checker
Fix intergrity checker

* Set salt length to 0
  See https://tools.ietf.org/html/rfc3447#page-38
* Fix tests for new phpunit

xx621998xx/server,nextcloud/server,endsguy/server,michaelletzgus/nextcloud-server,pmattern/server,pixelipo/server,whitekiba/server,jbicha/server,Ardinis/server,pixelipo/server,andreas-p/nextcloud-server,Ardinis/server,endsguy/server,andreas-p/nextcloud-server,jbicha/server,pixelipo/server,pmattern/server,Ardinis/server,nextcloud/server,jbicha/server,endsguy/server,pixelipo/server,michaelletzgus/nextcloud-server,endsguy/server,michaelletzgus/nextcloud-server,nextcloud/server,Ardinis/server,xx621998xx/server,xx621998xx/server,jbicha/server,whitekiba/server,pmattern/server,pmattern/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,whitekiba/server,endsguy/server,michaelletzgus/nextcloud-server,xx621998xx/server,pixelipo/server,jbicha/server,whitekiba/server,xx621998xx/server,Ardinis/server,pmattern/server,whitekiba/server,andreas-p/nextcloud-server