Send groovy script for updates to limit changes

This should prevent noop updates.  It has a tolerance for incoming_links
as well - if they are within 20% they won't be changed.

Fix selenium_exports_for_vagrant.sh to not reuse browsers - that no longer
works well with new releases of mediawiki_selenium.

Also fix busted hack for to speed up undelaying jobs.  Much faster better now.

Change-Id: I0655f67cfcb47c9f0587a77e789f1160ca5c429b
Merge "Send groovy script for updates to limit changes"