Update pcp configuration

[JohnStrunk]

• Enables Gluster PMDA
• Starts vol profiling on master
• Adds wrapper script to pcp2zabbix to handle only master exporting gluster metrics

Signed-off-by: John Strunk jstrunk@redhat.com

[JohnStrunk]

Rollout plan:

• Run the new pcp-collector playbook to update gluster servers
• Manually enable volume profiling on all supervols :disappointed:
• Run install-jumphost playbook to update w/ the pcp-aggregator role

[JohnStrunk]

After @ShyamsundarR gives a :+1: I'll rebase and merge.