Adding a scheduler script for Admin and Cluster

This scheduerl script will only start in CI if there is a cluster
of 10 proxysql nodes (including the tested one)

test/cluster/check_all_nodes.bash

@@ -0,0 +1,20 @@
+#!/bin/bash
+TABLES=(mysql_servers mysql_users mysql_query_rules mysql_query_rules_fast_routing global_variables proxysql_servers mysql_galera_hostgroups mysql_group_replication_hostgroups mysql_replication_hostgroups)
+
+ALL_TABLES=()
+
+for i in ${!TABLES[@]} ; do
+	ALL_TABLES+=(${TABLES[$i]})
+	ALL_TABLES+=("runtime_"${TABLES[$i]})
+done
+
+for i in ${!ALL_TABLES[@]} ; do
+	echo "SELECT * FROM ${ALL_TABLES[$i]};"
+done
+
+
+for i in ${!ALL_TABLES[@]} ; do
+	for p in 6032 `seq 26001 26009` ; do 
+		mysql -u admin -padmin -h 127.0.0.1 -P$p -e "SELECT * FROM ${ALL_TABLES[$i]}" > /dev/null 2> /dev/null &
+	done
+done

test/cluster/install_scheduler.bash

@@ -0,0 +1,4 @@
+#/bin/bash
+cp -f check_all_nodes.bash /tmp/check_all_nodes.bash
+chmod +x /tmp/check_all_nodes.bash
+mysql -u admin -padmin -h 127.0.0.1 -P6032 -e "INSERT INTO scheduler (interval_ms, filename) VALUES (7000, '/tmp/check_all_nodes.bash'); LOAD SCHEDULER TO RUNTIME; SAVE SCHEDULER TO DISK;"