LU-8813 utils: l_getidentity compatibility

LU-8813 utils: l_getidentity compatibility

Allow the new l_getidentity tool to parse old perm.conf which may
contains old 'rmtacl', 'rmtown'. These configurations are obsolete,
will be ignored directly, not error.

This patch also introduces new '-d' option to debug l_getidentity.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: Id0c54d0c24f551e93af80a0ab461870aa5037f84
Reviewed-on: http://review.whamcloud.com/23667
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Andrew Perepechko <andrew.perepechko@seagate.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>