Adding BOOTSTRAP_EXTRA_REPO_PARAMS parameter

The patch adds the paramter to has an ability passing
extra repo to the deployment.

Change-Id: I8d4c9b8e12596be3a460521f892d9790c6d34eb0
diff --git a/jenkins/client/job/oscore/salt_virtual_models.yml b/jenkins/client/job/oscore/salt_virtual_models.yml
index 911c1ce..17c4aa8 100644
--- a/jenkins/client/job/oscore/salt_virtual_models.yml
+++ b/jenkins/client/job/oscore/salt_virtual_models.yml
@@ -47,6 +47,10 @@
               type: string
               description: Version of formulas for salt-master bootstrap
               default: "nightly"
+            BOOTSTRAP_EXTRA_REPO_PARAMS:
+              type: string
+              default: ""
+              description: "Defines a list of extra repos with parameters, format: repo 1, repo priority 1, repo pin 1; repo 2, repo priority 2, repo pin 2"
             # openstack api
             OPENSTACK_API_URL:
               type: string