pg_upgrade: fix shutdown check for standby servers

Commit 244142d32a only tested for the
pg_controldata output for primary servers, but standby servers have
different "Database cluster state" output, so check for that too.

Diagnosed-by: Michael Paquier

Discussion: https://postgr.es/m/20180810164240.GM13638@paquier.xyz

Backpatch-through: 9.3

src/bin/pg_upgrade/controldata.c

@@ -150,7 +150,8 @@ get_control_data(ClusterInfo *cluster, bool live_check)
 				/* remove leading spaces */
 				while (*p == ' ')
 					p++;
-				if (strcmp(p, "shut down\n") != 0)
+				if (strcmp(p, "shut down\n") != 0 &&
+					strcmp(p, "shut down in recovery\n") != 0)
 				{
 					if (cluster == &old_cluster)
 						pg_fatal("The source cluster was not shut down cleanly.\n");