Show daemon arguments when launching a daemon with ./bin/phd.

Summary: Ref T4735. When launching daemons (with ./bin/phd start or ./bin/phd launch), print the arguments that are specified for the daemon.

Test Plan:
Ran ./bin/phd launch repo -- --not X.

> sudo ./bin/phd launch repo -- --not X
Preparing to launch daemons.
NOTE: Logs will appear in '/mnt/logs/phd/daemons.log'.

Launching daemon "PhabricatorRepositoryPullLocalDaemon" with arguments ["--not","X"].

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4735

Differential Revision: https://secure.phabricator.com/D9205