Add puppet-doc where appropriate

Conflicts:
	manifests/agents/metadata.pp
	manifests/keystone/auth.pp
	manifests/params.pp
	manifests/plugins/cisco.pp
	manifests/plugins/ovs/bridge.pp
	manifests/plugins/ovs/port.pp

Change-Id: I1a88250932eb35ba611f41d6d03ae757b4671c2b
(cherry picked from commit e4810aa8f0d59189769ea26ac30d0fe4dface88a)