MDEV-31332: Galera rsync sst to ignore .snapshot/ files

.snapshot exists as a directory on NetApp storage and
should not be copied during the sst process.

Thanks Daniel Czadek for the bug report.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

scripts/wsrep_sst_rsync.sh

@@ -564,6 +564,7 @@ FILTER="-f '- /lost+found'
         -f '- /.Trashes'
         -f '- /.pid'
         -f '- /.conf'
+        -f '- /.snapshot/'
         -f '+ /wsrep_sst_binlog.tar'
         -f '- $ib_home_dir/ib_lru_dump'
         -f '- $ib_home_dir/ibdata*'
@@ -673,7 +674,8 @@ FILTER="-f '- /lost+found'
         cd "$DATA"
 
         find . -maxdepth 1 -mindepth 1 -type d -not -name 'lost+found' \
-             -not -name '.zfs' -print0 | xargs -I{} -0 -P $backup_threads \
+             -not -name '.zfs' -not -name .snapshot -print0 \
+	     | xargs -I{} -0 -P $backup_threads \
              rsync ${STUNNEL:+--rsh="$STUNNEL"} \
              --owner --group --perms --links --specials --ignore-times \
              --inplace --recursive --delete --quiet $WHOLE_FILE_OPT \