It looks like Marionette's log file can fill up all available disk space when Marionette is used in long-running monkey tests. We should either limit the disk space the log consumes, or remove it entirely.
Created attachment 703443 [details] [diff] [review] Use RotatingFileAppender for Marionette's log, This should prevent Marionette's log from ever exceeding 2MB.
pushed to try: https://tbpl.mozilla.org/?tree=Try&rev=20c53c5456e8
(Ex post facto approval since this blocks required stability testing for product.)
Landed on mozilla-b2g18/gaia master prior to the 1/25 branching to mozilla-b2g18_v1_0_0/v1.0.0, updating status-b2g-v1.0.0 to fixed.