Add a debug log entry containing the command line.
Add a debug log entry containing the command line.

When doing user support, we often have to ask people what command line they
ran. Sometimes they lie to us in response.

This trivial change adds a debug log with the current command line. This way
we'll hopefully cut down on support round-trips a fair bit.

Testing done:
Ran a few commands with --debug and saw the correct output.

reviewboard/rbtools,reviewboard/rbtools,reviewboard/rbtools