Remove some "Phacility" and "epriestley" references
Summary:
Ref T13658. This just scrubs some of the simple references from the codebase.
Most of what's left is in documentation which won't be relevant for a fork and/or which I need to separately revise (or more-or-less delete) at some point anyway.
I removed the "install RHEL" and "install Ubuntu" scripts outright since I don't have any reasonable way to test them and don't plan to maintain them.
Test Plan: Grepped for "phacility", "epriestley"; ran unit tests.
Reviewers: cspeckmim
Reviewed By: cspeckmim
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13658
Differential Revision: https://secure.phabricator.com/D21678