message: renumber backends to zero indexed.
diff: @@ -5,7 +5,7 @@ threads=2
  type=service
  router=readconnroute
  router_options=master
  -servers=database1,database2,database3
  +servers=database0,database1,database2
  user=root
  passwd=blah
  localhost_match_wildcard_host=1
  @@ -19,7 +19,7 @@ port=3306
  [Galera Monitor]
  type=monitor
  module=galeramon
  -servers=database1,database2,database3
  +servers=database0,database1,database2
  user=root
  passwd=blah
  @@ -32,22 +32,22 @@ router=cli
  type=listener
  service=CLI
  protocol=maxscaled
  -address=localhost
  +address=127.0.0.1
  port=6603
  -[database1]
  +[database0]
  type=server
  address=mariadb-0.mariadb
  port=3306
  protocol=MySQLBackend
  -[database2]
  +[database1]
  type=server
  address=mariadb-1.mariadb
  port=3306
  protocol=MySQLBackend
  -[database3]
  +[database2]
  type=server
  address=mariadb-2.mariadb
  port=3306
  