allow neutron::agents::ovs without package install

This alters the service notification and dependency behaviour for
neutron::agents::ovs such that if the package is not installed (i.e.
package_ensure => absent, enabled => false) the class still runs without
producing errors.  This is to allow the generation of config files
without needing to install the package in the first place.

Change-Id: I027313518f778d58e6e19b9b933ff17c0094a8aa
Closes-Bug: #1298146
Fix network_vlan_ranges parameter for OVS plugin

Class neutron::plugins::ovs expects string value in network_vlan_ranges parameter,
but validate_network_vlan_ranges will fail when value is comma separated list
of valid values. This patch is fixing this problem

Change-Id: If5b8ef59a600b3204415853ad796fb0537fefe4a
Merge "Fix network_vlan_ranges parameter for OVS plugin"
Updated to match semver and release notes.

Before this update the Modulefile was not following semver in
relation to stable/havana, and the README files were not in sync.
This update introduces proper semver and consistency.

Change-Id: I32c05030922c71e982e79fef2e87688cb882f9ae
Merge "allow neutron::agents::ovs without package install"
Merge "Updated to match semver and release notes."