Revert "Merge branch Pull Reuqest 209 into develop"

This reverts commit 20373f3, reversing
changes made to 570f38f.

These changes caused delete-deployment to fail since the drain scripts
are run in parallel on all nodes.

Author: pcf-core-services-writer

jobs/mysql/templates/drain.sh

@@ -1,53 +1,15 @@
-#!/usr/bin/env bash
+#!/bin/bash -e
 
 <% if p('cf_mysql_enabled') == true %>
-set -e -o pipefail
-
-<%
-  cluster_ips = link('mysql').instances.map(&:address)
-  if_link('arbitrator') do
-    cluster_ips += link('arbitrator').instances.map(&:address)
-  end
-%>
-
-CLUSTER_NODES=(<%= cluster_ips.map{|e| e }.join(' ') %>)
-MYSQL_PORT=<%= p("cf_mysql.mysql.port") %>
-GALERA_HEALTHCHECK_PORT=<%= p("cf_mysql.mysql.galera_healthcheck.port") %>
-LOG_DIR="/var/vcap/sys/log/mysql"
-
-# If the node is not running, exit drain successfully
-if ! ps -p "$(</var/vcap/sys/run/mysql/mysql.pid)" >/dev/null; then
-  echo "$(date): mysql is not running: OK to drain" >> "${LOG_DIR}/drain.log"
-  echo 0; exit 0 # drain success
-fi
-
-# Check the galera healthcheck endpoint on all of the nodes. If the http status returned is 000, there
-# is no node at that IP, so we assume we are scaling down. If the http status returned is 200 from all nodes
-# it will continue to drain. If it detects any other nodes to be unhealthy, it will fail to drain
-# and exit.
-for NODE in "${CLUSTER_NODES[@]}"; do
-  set +e
-  status_code=$(curl -s -o "/dev/null" -w "%{http_code}" "$NODE:$GALERA_HEALTHCHECK_PORT")
-  set -e
-  if [[ $status_code -eq 000 || $status_code -eq 200 ]]; then
-    continue
-  else
-    echo "$(date): galera heathcheck returned $status_code; drain failed on node ${NODE}" >> "${LOG_DIR}/drain.err.log"
-    exit -1
-  fi
-done
-
-# Actually drain with a kill_and_wait on the mysql pid
 PIDFILE=/var/vcap/sys/run/mariadb_ctl/mariadb_ctl.pid
 source /var/vcap/packages/cf-mysql-common/pid_utils.sh
 
 set +e
-kill_and_wait "${PIDFILE}" 300 0 > /dev/null
+kill_and_wait ${PIDFILE} 300 0 > /dev/null
 return_code=$?
 
 echo 0
 exit ${return_code}
-
 <% else %>
 echo 0
 exit 0