Add EXTRA_REPOS to OSCC jobs

Update the following jobs with ability to pass extra
repo during bootstrap phase:

  * test-cookiecutter-model

Change-Id: I8cf574547fdad0b1e4df27c517d8ebaec333f5dd
diff --git a/jenkins/client/job/oscore/cookiecutter.yml b/jenkins/client/job/oscore/cookiecutter.yml
index 0ea2bba..53d8260 100644
--- a/jenkins/client/job/oscore/cookiecutter.yml
+++ b/jenkins/client/job/oscore/cookiecutter.yml
@@ -87,6 +87,10 @@
               type: boolean
               description: "Delete Heat stack when finished (bool)"
               default: 'false'
+            EXTRA_REPOS:
+              type: text
+              description: "Yaml based extra repos metadata to be added during bootstrap phase"
+              default: ''
         oscore-test-cookiecutter-models:
           display_name: oscore-test-cookiecutter-models
           name: oscore-test-cookiecutter-models