crash_sender: include verbose curl output in error logs

BUG=None
TEST=Manual
TEST=`cbuildbot {arm,amd64,x86}-generic-full` pass

Change-Id: I7ee8f98aa1721d50bb8b86fd84b50d9432eaaa9d
Reviewed-on: https://chromium-review.googlesource.com/198682
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed