LU-10633 mdt: Convert MDS restoring RPC message to D_WARNING

LU-10633 mdt: Convert MDS restoring RPC message to D_WARNING

Using D_WARNING instead of D_RPCTRACE causes the message to be both
logged in the Lustre DK logs and on the system console.  This patch
changes the MDS restore/replay debug message to use D_WARNING.

A restored/replayed metadata request indicates some sort of underlying
error, and even when handled correctly, should generate a warning.

Test-Parameters: trivial
Change-Id: Iff98521853323469fc5d6c7d546ca83477b1cb9f
HPE-bug-id: LUS-2578
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Reviewed-on: https://review.whamcloud.com/31214
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Vladimir Saveliev <vlaidimir.saveliev@hpe.com>
Reviewed-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>