Add a warning to user that SSH needs restarted

After the ssh config patch is applied, announce
to the user that they will need to restart sshd.

Signed-off-by: David Mulder <dmulder@samba.org>

platform/debian/scripts/postinst

@@ -32,4 +32,5 @@ SSHD_CONFIG_DIR="/etc/ssh/sshd_config.d"
 SSHD_CONFIG_FILE="${SSHD_CONFIG_DIR}/himmelblau.conf"
 if [ -d "$SSHD_CONFIG_DIR" ]; then
     echo "KbdInteractiveAuthentication yes" > "$SSHD_CONFIG_FILE"
+    echo "Please restart the ssh daemon to ensure MFA works properly!"
 fi