Fix a bad call to "writeInfo()" in "bin/phd stop" with no PHABRICATOR_INSTANCE defined

Summary: See <https://discourse.phabricator-community.org/t/phd-status-calls-to-undefined-method-when-theres-no-instance/2918>. This call should be `logInfo()`.

Test Plan:
- Purged `PHABRICATOR_INSTANCE` from my environment. In a Phacility development environment, it comes from loading `services/`.
- Ran `bin/phd stop` with all daemons already stopped.
- Before: bad call.
- After: helpful error.
- Ran some other `bin/phd start`, `bin/phd status`, etc., to kick the tires.
- Grepped for remaining `writeInfo()` calls (found none).

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20649

src/applications/daemon/management/PhabricatorDaemonManagementStatusWorkflow.php

···
             'instance ("%s").',
             $instance));
       } else {
-        $this->writeInfo(
+        $this->logInfo(
           pht('NO DAEMONS'),
           pht('There are no running daemon processes.'));
       }