Create a wrapper around conftool for our pooling/depooling needs
Summary:
Also go ahead and use it for what our original usecase was: depooling the proxies while we're using them. Should free them up just a tad and avoid some minor flapping we've seen before
Test Plan: Totally untested. Oh, and it breaks everything for now because we don't have conftool installed in vagrant or on deploy masters. So probably shouldn't merge yet
Reviewers: Release-Engineering-Team, mmodell, fgiunchedi, Joe, thcipriani
Reviewed By: Release-Engineering-Team, mmodell, Joe, thcipriani
Subscribers: thcipriani, Joe, jenkins
Tags: Release-Engineering-Team
Maniphest Tasks: T125629, T163565
Differential Revision: https://phabricator.wikimedia.org/D600