Bug 957453 - enable unidle from v2 app builder

The v2 build process triggered by a git push tries to start the gear.  If the gear was idled, that start needs to include marking the gear as no longer idle in the front-end Apache server.  That is a root operation.  Since the gear build runs as the gear user, it doesn't have privileges to do that so a Net::HTTP call is made instead to wake up the app.