rabbitmq collectd plugin should use loopback address on osp16

[jaison]

rabbitmq plugin in collectd fails in osp16 undercloud and overcloud as from osp16 onwards rabbitmq_management rabbitmq plugin listens on 127.0.0.1 on port 15672 .
OSP16:
Undercloud/Overcloud:
  {rabbitmq_management, [
    {rates_mode, none}
, {listener, [
      {ip, "127.0.0.1"},
      {port, 15672}
    ]}
OSP13:
Undercloud:
/etc/rabbitmq/rabbitmq.config
  {rabbitmq_management, [
    {listener, [
      {ip, "192.168.24.1"},
      {port, 15672}
    ]}
Overcloud:
  {rabbitmq_management, [
    {rates_mode, none}
, {listener, [
      {ip, "127.0.0.1"},
      {port, 15672}
    ]}

** We need to add a logic to use loopback address in environments with containerized collectd.