vpp: Allow setting the host parameter

This change allows users to set the host parmeter for ml2+vpp plugin.
The parameter was hard-coded by $::hostname but it would result in
incosnsistency with the hostname set by neutron::host .

Change-Id: I25bef469a1caeede529054579d014788b84de9e4

manifests/agents/ml2/vpp.pp

@@ -16,6 +16,10 @@
 #   (optional) Whether to start/stop the service
 #   Defaults to true
 #
+# [*host*]
+#   (optional) Hostname to be used by the server, agents and services.
+#   Defaults to $::hostname
+#
 # [*physnets*]
 #   (optional) Comma-separated list of <physical_network>:<physical_interface>
 #   tuples mapping physical network names to agent's node-specific physical
@@ -46,6 +50,7 @@ class neutron::agents::ml2::vpp (
   $package_ensure = 'present',
   $enabled        = true,
   $manage_service = true,
+  $host           = $::host,
   $physnets       = $::os_service_default,
   $etcd_host      = $::os_service_default,
   $etcd_port      = $::os_service_default,
@@ -66,7 +71,7 @@ class neutron::agents::ml2::vpp (
     'ml2_vpp/etcd_port': value => $etcd_port;
     'ml2_vpp/etcd_user': value => $etcd_user;
     'ml2_vpp/etcd_pass': value => $etcd_pass;
-    'DEFAULT/host':      value => $::hostname;
+    'DEFAULT/host':      value => $host;
   }
 
   package { 'neutron-vpp-agent':

releasenotes/notes/vpp-host-5df0f4bad5bb92fc.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``host`` parameter has been added to
+    the ``neutron::agents::ml2::vpp`` class.

spec/classes/neutron_agents_ml2_vpp_spec.rb

@@ -65,6 +65,15 @@ describe 'neutron::agents::ml2::vpp' do
       end
     end
 
+    context 'with the host parameter' do
+      before :each do
+        params.merge!(:host => 'myhost')
+      end
+      it 'should set the host parameter' do
+        should contain_neutron_agent_vpp('DEFAULT/host').with_value('myhost')
+      end
+    end
+
     context 'when supplying a physnet mapping' do
       before :each do
         params.merge!(:physnets => 'physnet0:GigabitEthernet2/2/0,physnet1:GigabitEthernet2/2/1')