Added iscsi-luns resource agent, which allows exposing (multiple) dynamically managed iscsi luns as a single HA resource.
Added iscsi-helper.sh script, which handles addition/deletion/etc. of luns to existing iscsi-luns resources.
Added missing iscsi-lib.sh
Added a proxomox wrapper for iscsi-helper.sh so we can use it as helper for ZFS plungin.