Add possibility to set ganglia->globals->{deaf, host_dmax, send_metadata_interval} as well as use udp_send_channel->bind_hostname

We needed to be able to set the following settings in gmond.conf and tested the provided patches under CentOS6.5:
globals {
...
  deaf = yes
...
  host_dmax = 691200 /*secs */
...
  send_metadata_interval = 60 /*secs */
}

udp_send_channel {
...
  bind_hostname = yes
...
}