Add test for crosscheck of repmgr

tests/repmgr-crosscheck/run.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# https://github.com/paunin/PostDock/issues/225
+docker-compose up -d pgmaster pgslave1 pgslave3
+set -e
+
+docker-compose exec -T pgmaster wait_local_postgres
+docker-compose exec -T pgslave1 wait_local_postgres
+docker-compose exec -T pgslave3 wait_local_postgres
+sleep 10
+
+# Result matrix should look like this(5 rows, 3 rows with stars but with no question marks):
+#
+#  Name | Id |  1 |  2 |  4 
+# ------+----+----+----+----
+# node1 |  1 |  * |  * |  * 
+# node2 |  2 |  * |  * |  * 
+# node4 |  4 |  * |  * |  * 
+
+for CONTAINER in "pgmaster" "pgslave1" "pgslave3"; do
+    echo "Checking CONTAINER=$CONTAINER"
+    UNKNOWN_NUMBER=`docker-compose exec $CONTAINER bash -c 'gosu postgres repmgr cluster crosscheck 2>/dev/null' | grep -v '?' | grep '*' | wc -l | tr -d ' '`
+    if [[ "3" != "$UNKNOWN_NUMBER" ]]; then
+        echo ">>> CrossCheck failed for CONTAINER=$CONTAINER (UNKNOWN_NUMBER=$UNKNOWN_NUMBER)"
+        exit 1
+    fi
+done
+
+
+