LU-8955 cfg: reserve flags for SELinux status checking

LU-8955 cfg: reserve flags for SELinux status checking

Reserve LCFG_NODEMAP_SET_SEPOL config flag that will be used to
define sepol parameter on nodemap entries.
Reserve OBD_CONNECT2_SELINUX_POLICY connection flag that will be set
(in ocd_connect_flags2) if a client supports sending the SELinux
policy status info.
Add checks for all lcfg_command_type constants, along with lustre_cfg
and cfg_record_type.

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I009eb8f1597b51acce7dc21498a43096e41cd034
Reviewed-on: https://review.whamcloud.com/33797
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <farr0186@gmail.com>