Set rax image metadata properly

For our rax images we need to tell rax two things. First that we should
use hvm when booting these nodes (more performance yay). Second that we
are not using the xenapi agent (nova agent) and instead rely on config
drive + glean to set things up for us.

Change-Id: I19f38e4173b1109d153270879e44beef6eaf0e9c

modules/openstack_project/templates/nodepool/nodepool.yaml.erb

@@ -277,6 +277,9 @@ providers:
         username: jenkins
         private-key: /home/nodepool/.ssh/id_rsa
         config-drive: true
+        meta:
+          vm_mode: hvm
+          xenapi_use_agent: 'false'
       - name: devstack-f21
         base-image: 'Fedora 21 (PVHVM)'
         min-ram: 8192
@@ -348,6 +351,9 @@ providers:
         username: jenkins
         private-key: /home/nodepool/.ssh/id_rsa
         config-drive: true
+        meta:
+          vm_mode: hvm
+          xenapi_use_agent: 'false'
       - name: devstack-f21
         base-image: 'Fedora 21 (PVHVM)'
         min-ram: 8192
@@ -419,6 +425,9 @@ providers:
         username: jenkins
         private-key: /home/nodepool/.ssh/id_rsa
         config-drive: true
+        meta:
+          vm_mode: hvm
+          xenapi_use_agent: 'false'
       - name: devstack-precise-check
         base-image: 'Ubuntu 12.04 LTS (Precise Pangolin) (PVHVM)'
         min-ram: 8192