Gerrit/Code review/Code review hours

(see T128371)

Plan

 * Setup regulary hours for code-review
 * Find an easy way to get changes review faster

Goals

 * Make Code review not stagnating
 * Give people an easy way to find people who would review their changes
 * For people who recived a -1, give them the possibilty to get a third opinion

Process
Note: This is just a draft, and not fully implemented yet
 * Set up code review hour events multiple times a week
 * Ask reviewer to join this hour, and review patches where a review gets requested
 * As developer search an event which fits for you, and join the channel, request a review
 * Alternativly: Sign up your patches for review at phabricator (more bueraucracy)