Migrate log_{file,dir} params to neutron class

The log_{dir,file} params was configured in the neutron class::server,
these parameters was not available classes neutron::agent::*
This patch fixes this.

(cherry picked from commit c751443f4fef5e71c0246b5410a2b712aeb656d4)
Closes-bug: #1282296
Change-Id: I205b0ed5db08199000ec11b2212afedf67bf2ed7
neutron-metering-agent service name is wrong

In Ubuntu the neutron-metering-agent package and Upstart service are named
neutron-plugin-metering-agent. In Debian they are named
neutron-metering-agent.

Partial-Bug: #1284179
(cherry picked from commit 57e16648629b8c541e094b848cecac53137949c4)

Change-Id: I76b56886a4d239b279731dc1e85c17a7f380aa76
VPNaaS service name is wrong

In Ubuntu the VPNaaS service name and package are
neutron-plugin-vpn-agent. In Debian the VPNaaS service name and package
are neutron-vpn-agent.

Closes-Bug: #1285314
(cherry picked from commit 1e3ff014972fb0f18f8509d404df583ec8a11762)

Change-Id: Id3a0e2e939d2608802b3b2b39634e6c8bb3c32f5
Merge "neutron-metering-agent service name is wrong" into stable/havana
Merge branch 'stable/havana' of https://github.com/stackforge/puppet-neutron into havana