extra_vars and image_name parametrization added to build images Jenkins jobs

Change-Id: I047d0a48cb329da972f7dcb2f03c5870bbe380a2
diff --git a/jenkins/client/job/image/ubuntu.yml b/jenkins/client/job/image/ubuntu.yml
index fa84813..8d7e1de 100644
--- a/jenkins/client/job/image/ubuntu.yml
+++ b/jenkins/client/job/image/ubuntu.yml
@@ -79,6 +79,12 @@
             OPENSTACK_API_CLIENT:
               type: string
               default: ""
+            IMAGE_NAME:
+              type: string
+              default: ubuntu-14-04-x64
+            EXTRA_VARIABLES:
+              type: text
+              default: ""
         build-image-ubuntu-16-04:
           type: workflow-scm
           concurrent: false
@@ -145,3 +151,9 @@
             OPENSTACK_API_CLIENT:
               type: string
               default: ""
+            IMAGE_NAME:
+              type: string
+              default: ubuntu-16-04-x64
+            EXTRA_VARIABLES:
+              type: text
+              default: ""
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