Don't log any output while running tests
Introduce mocks and test for udp_bridge.py collector
udp_bridge.py: If we get a line starting with "put ", remove that part

This allows us to use a standard OpenTSDB client to send data to the UDP bridge,
instead of having to make special forks for each client we want to use.
udp_bridge.py: Support Python 2.4
Merge pull request #167 from mwolson/normalize-udp-input

Normalize udp input