Upload custom configuration for js-draft build.

With CORS support in the API, and custom configuration loading in the
webclient, we can now let our js-draft build connect to a live API and
function like a regular client. This change makes the assumption that
any javascript project will include static docs-draft assets in the
$PROJECT_ROOT/test/draft directory, which will be uploaded as-is to the
same destination as the draft build.

Depends on: https://review.openstack.org/#/c/124201

Change-Id: Ia68f1f5e13098faac9e94c9655cf4bd8aaceb02b

jenkins/jobs/javascript.yaml

@@ -68,6 +68,11 @@
               source: 'dist/**'
               keep-hierarchy: true
               copy-after-failure: false
+              # Upload any additional files necessary for the docs-draft build
+            - target: 'docs-draft/$LOG_PATH'
+              source: 'test/draft/**'
+              keep-hierarchy: true
+              copy-after-failure: false
     node: '{node}'
 
 # Builds a release tarball