LU-17643 gss: make a local copy of the sptlrpc llog

LU-17643 gss: make a local copy of the sptlrpc llog

Make a local copy on server side of the sptlrpc llog, so that
the targets that do not manage to connect to the MGS know at least
which security flavor to accept from clients.
This needs to pass the super_block to config_log_find_or_add().

Add sanity-sec test_70 to check that sptlrpc llog on MDS and OSS side
is equivalent to the one from the MGS.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I81f0136746e2df7cca1b34c4a17e4b7135a43c29
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54394
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <adegremont@nvidia.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>