update some FM flags

fm itself can always be verbose.  We'll rarely call it directly
and when we do and we don't want to see its output, we can always
pipe to /dev/null.

Switch fm_bot.go over to random shuffle by default, and to verbose by
default with a -q/-quiet flag to only print failures.

Change-Id: Ibd53bf7f1d29e0fd5deb7d4689dc0ca100df648f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205587
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed