bug_chomper: Switch from standard log API to golang's glog API.
bug_chomper: Switch from standard log API to golang's glog API.

That gives us a more fine grained control over the logging of the
application.

BUG=skia:3038
TEST=./run_server.sh --alsologtostderr=true --log_dir=.
R=borenet@google.com

Review URL: https://codereview.chromium.org/747353002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot