[ubuntu images] make ubuntu interface name configurable

ubuntu images are normally created with its primary interface named
ens3 - however, in some cases that name can be different and its value
should be configurable

Change-Id: Ie9284ecda743a3154f36cd84ec492a3d15c6fbd5

infrared_plugin/plugin.spec

@@ -152,6 +152,10 @@ subparsers:
             type: Value
             help: user name to be used to connect to TripleO Overcloud hosts
             ansible_variable: overcloud_ssh_username
+          ubuntu-interface-name:
+            type: Value
+            help: primary interface name obtained from the ubuntu instances
+            ansible_variable: ubuntu_interface_name
 
       - title: Run stage
         options:

roles/tobiko-configure/defaults/main.yaml

@@ -13,6 +13,8 @@ test_default_conf:
   tripleo:
     undercloud_ssh_hostname: "{{ undercloud_ssh_hostname }}"
     overcloud_ssh_username: "{{ overcloud_ssh_username }}"
+  ubuntu:
+    interface_name:  "{{ ubuntu_interface_name }}"
 
 test_log_debug: ''
 
@@ -26,3 +28,5 @@ undercloud_hostname: '{{ groups.get("undercloud", []) | first | default("undercl
 undercloud_ssh_hostname: ''
 
 overcloud_ssh_username: ''
+
+ubuntu_interface_name: ''

tobiko/openstack/glance/config.py

@@ -62,6 +62,8 @@ def get_images_options():
                         help="Default " + name + " username"),
              cfg.StrOpt('password',
                         help="Default " + name + " password"),
+             cfg.StrOpt('interface_name',
+                        help="Default " + name + " interface name"),
              cfg.FloatOpt('connection_timeout',
                           default=None,
                           help=("Default " + name +

tobiko/openstack/stacks/_ubuntu.py

@@ -118,7 +118,7 @@ class UbuntuImageFixture(UbuntuMinimalImageFixture,
 
     @property
     def ethernet_device(self) -> str:
-        return 'ens3'
+        return CONF.tobiko.ubuntu.interface_name or 'ens3'
 
     @property
     def vlan_id(self) -> int: