disable third-party software management

Send a warning for each managed resource that is not part of OpenStack.
It has been discussed with OpenStack community [1].

It affects:
* external repositories
* external packages
* external services

[1] http://permalink.gmane.org/gmane.comp.cloud.openstack.devel/65029

Change-Id: Iad673e765eda348606a7d455d17d62706ff0328c

manifests/agents/n1kv_vem.pp

@@ -202,12 +202,14 @@ class neutron::agents::n1kv_vem (
         gpgkey   => "${n1kv_source}/RPM-GPG-KEY"
         #proxy   => '_none_',
       }
+      warning('cisco-vem-repo repository management is deprecated, it will be dropped in a future release.')
     }
     package {'nexus1000v':
       ensure => $package_ensure,
       tag    => 'openstack',
     }
   }
+  warning('nexus1000v package management is deprecated, it will be dropped in a future release.')
 
   if $manage_service {
     if $enable {
@@ -220,6 +222,7 @@ class neutron::agents::n1kv_vem (
   service { 'nexus1000v':
     ensure    => $service_ensure,
   }
+  warning('nexus1000v service management is deprecated, it will be dropped in a future release.')
 
   #Upon config change in 'n1kv.conf' execute below 'vemcmd reread config'.
   #No need to restart service.

manifests/plugins/ml2/bigswitch.pp

@@ -26,4 +26,5 @@ class neutron::plugins::ml2::bigswitch (
       tag    => 'openstack',
     }
   )
+  warning('python-networking-bigswitch package management is deprecated, it will be dropped in a future release.')
 }

manifests/plugins/ml2/cisco.pp

@@ -28,4 +28,5 @@ class neutron::plugins::ml2::cisco (
       tag    => 'openstack',
     }
   )
+  warning('python-networking-cisco package management is deprecated, it will be dropped in a future release.')
 }

manifests/plugins/plumgrid.pp

@@ -97,6 +97,7 @@ class neutron::plugins::plumgrid (
     ensure => $package_ensure,
     name   => $::neutron::params::plumgrid_pythonlib_package
   }
+  warning('neutron-plumlib-plumgrid package management is deprecated, it will be dropped in a future release.')
 
   if $::osfamily == 'Debian' {
     file_line { '/etc/default/neutron-server:NEUTRON_PLUGIN_CONFIG':