Rework on the PF_Ring plugin to make it support load balancing with PF_Ring+DNA correctly (two ways).
Fixed an issue where a pf_ring app instance selection.

If there were multiple dnaclusters in use on a single host
app instances identifiers weren't being selected correctly.
Merge remote-tracking branch 'origin/topic/seth/pf-ring-plugin-updates'

* origin/topic/seth/pf-ring-plugin-updates:
  Fixed an issue where a pf_ring app instance selection.
  Rework on the PF_Ring plugin to make it support load balancing with PF_Ring+DNA correctly (two ways).

Conflicts:
	BroControl/plugins/lb_pf_ring.py