Upload karma.subunit to log server

If a javascript project generates a subunit file, this should
be uploaded to our log server so that it can be imported into
elasticsearch. This patch ensures that this happens.

Change-Id: I10717f827c70a58a7662842f1f77b1aa5be951af

jenkins/jobs/javascript.yaml

@@ -41,6 +41,10 @@
               source: 'npm-shrinkwrap.json'
               keep-hierarchy: false
               copy-after-failure: false
+            - target: 'logs/$LOG_PATH'
+              source: 'karma.subunit'
+              keep-hierarchy: false
+              copy-after-failure: true
 
 # Builds and uploads a tarball using NPM.
 - job-template: