ALTER TABLE phabricator_file.file
  ADD UNIQUE KEY (phid);

ALTER TABLE phabricator_project.project
  ADD UNIQUE KEY (phid);

ALTER TABLE phabricator_herald.herald_condition
  ADD KEY (ruleID);

ALTER TABLE phabricator_herald.herald_action
  ADD KEY (ruleID);
Add missing keys to some tables
Add missing keys to some tables

Summary: I wrote a little query plan plugin for "Services", it's not ready yet
but it found a few cases where we're doing table scans.
Test Plan:
https://secure.phabricator.com/file/view/PHID-FILE-374fd7e846a0ce27d5fb/
https://secure.phabricator.com/file/view/PHID-FILE-2f680de9b8c3c3b7089e/
https://secure.phabricator.com/file/view/PHID-FILE-742f645fcf011252ff25/

Reviewed By: jungejason
Reviewers: jungejason, tuomaspelkonen, aran
CC: aran, jungejason
Differential Revision: 627
