Increase phd sanity check timeout

Summary:
A user reported that their install (on an unusual piece of hardware) was hitting this timeout. We don't need to be quite so stingy; just use the default 30s timeout.

Also remove some kind of sentence fragment since I no longer remember what it meant and it doesn't make sense.

Test Plan: This change resolved the issue.

Reviewers: btrahan, jungejason

Reviewed By: jungejason

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1805