LU-13791 mdt: parameter to tune capabilities

LU-13791 mdt: parameter to tune capabilities

Add mdt.*.enable_cap_mask to allow specific capabilities to
be enabled and disabled individually.

Fixes: f05edf8e2b ("LU-13791 sec: enable FS capabilities")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I6fc0130a90693d673d8c2158e7e31c2de951553d
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53500
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>