R1:a705f336a306

Add vebose logging to PhutilRepositoryPullDaemon

Summary: Add verbose logging. This logging is activated by setting "phd.verbose" in the config, running "phd debug", or explicitly in scripts/repository/pull.php and scripst/repository/discover.php

Test Plan:
>>> orbital ~/devtools/phabricator $ ./scripts/repository/discover.php GTEST
Discovering 'GTEST'...
<VERB> PhabricatorRepositoryPullLocalDaemon Discovering commits in repository 'GTEST'...
<VERB> PhabricatorRepositoryPullLocalDaemon Examining…