Use events rather than Conduit to report daemon status in Phabricator

Summary: Ref T1670. Use events and direct database writes instead of Conduit. Deprecate the Conduit methods.

Test Plan: Ran daemons, used the console to review daemon event logs.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1670

Differential Revision: https://secure.phabricator.com/D6536