crash_sender: disable uploading on test images

Not sure what has changed, but we're uploading crashes now for test images
when we don't want to.  When the channel in /etc/lsb-release is marked as
a test channel (which happens for all test images), exit early.

BUG=chromium:239862
TEST=passed vmtests (logging_CrashSender & logging_UserCrash)
TEST=`cbuildbot {arm,amd64,x86}-generic-full` pass

Change-Id: I4a35aaa34b590c575de639888ed8be68bc9608b6
Reviewed-on: https://gerrit.chromium.org/gerrit/51084
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed
tree: 85e96989f6d123d3717689e3d876e86882878e9e
  1. crash_reporter/