MDEV-22554: galera_sst_mariabackup fails with "Failed to start mysqld.2"

The problem is caused by the operation of netcat streamer and does
not appear on systems where socat is installed. We need to add the
"-N" option for netcat to call shutdown() on the socket when receiving
EOF from STDIN.

scripts/wsrep_sst_mariabackup.sh

@@ -202,7 +202,11 @@ get_transfer()
                 tcmd="nc ${REMOTEIP} ${TSST_PORT}"
             elif nc -h 2>&1 | grep -q -- '-d\>';then
                 # Debian netcat
-                tcmd="nc ${REMOTEIP} ${TSST_PORT}"
+                if nc -h 2>&1 | grep -q -- '-N\>';then
+                   tcmd="nc -N ${REMOTEIP} ${TSST_PORT}"
+                else
+                   tcmd="nc ${REMOTEIP} ${TSST_PORT}"
+                fi
             else
                 # traditional netcat
                 tcmd="nc -q0 ${REMOTEIP} ${TSST_PORT}"