bug_chomper: Make server's port configurable.

Make 'port' a flag so you can change it from the command line, making the
server more flexible and allowing us to change in which port it listen
to requests.

$ ./run_server.sh --port :8002

BUG=None
TEST=see above
R=borenet@google.com

Review URL: https://codereview.chromium.org/649663003
2 files changed