LibUp

We need a utility/tool to semi-automatically manage upgrades of libraries and other developer dependencies for dozens/hundreds of repos instead of developers (aka Legoktm) running scripts on their laptops.

Want
Basic requirements: Nice-to-haves:
 * Does not run under Legoktm's gerrit account
 * Pick a few canary repositories to do the upgrade first, then submit patches to bulk upgrade the rest
 * Ability to specifically pick what library to upgrade
 * All submitted patches use the " " topic
 * Web interface for everything!!11
 * Discovers new repositories immediately instead of a hardcoded list
 * auto +2 trivial patches (composer.json bumps only) ???

Cool features:
 * Know which repos are going to fail the upgrade beforehand

Current status

 * labs project requested: T116697
 * Code in gerrit labs/libraryupgrader
 * Manually triggered (374944)
 * Re-enables all disabled sniffs, and then runs PHPCS and determines which sniffs are failing (output: http://phpcs-dashboard.wmflabs.org/).
 * Uses docker for all actions, so everything is sandboxed and easy to clean up.