R1:136af8d2ab94

Do not perform write in PhabricatorDaemonLogQuery by default

Summary:
See <http://github.com/facebook/phabricator/issues/487>. By default, we perform a write in this query to moved daemons to "dead" status after a timeout. This is normally reasonable, but after D7964 we do a setup check against the daemons, which means this query is invoked very early in the stack, before we have a write guard.

Since doing this write unconditionally is unnecessarily, surprising, and overly ambitious, make the write…