nethserver-samba-migrate-sam ($useGroupMappingDb): removed unused variable. Refs #2806
nethserver-samba-machine-create: allocate Uid, if not given. Refs #2832
nethserver-samba-migrate-sam: read machine uid from smbpasswd if Uid prop is missing. Refs #2832
nethserver-samba-netcacheflush: fixed shell shebang. Refs #2792