[EL6] Adding possibility to set ganglia->globals->deaf parameter for gmond.conf

[EL6] Adding possibility to set ganglia->globals->deaf parameter for
gmond.conf
[EL6] Adding possibility to set ganglia->globals->host_dmax parameter for gmond.conf

[EL6] Adding possibility to set ganglia->globals->host_dmax parameter
for gmond.conf
[EL6] Adding possibility to set ganglia->globals->send_metadata_interval for gmond.conf

[EL6] Adding possibility to set ganglia->globals->send_metadata_interval
for gmond.conf
[EL6] Adding possibility to set udp_send_channel >bind_hostname in gmond.conf

[EL6] Adding possibility to set udp_send_channel >bind_hostname in
gmond.conf
Renaming ganglia_globals_* variables to globals_* and adding description in the README

Renaming ganglia_globals_* variables to globals_* and adding description
in the README
Added additional params
Fixed scope
Removed note about specific changes to RHEL6/CentOS6
Formatting etc
Add global_override_hostname
Add gmond template interpolation
Add metadata.json to git
Bump to version 1.4.0
Modulefile is deprecated in favour of metadata.json