utils.logger will overwrite its own logs when run from two separate modules.

Example:
binary_search_state.py and binary_search_perforce.py with both write to logs/binary_search_state.py.out overwriting each other.

Run the interactive cros_pkg bisection. If you ctrl-c right after the install script begins you will notice log output from binary_search_perforce but all log output from binary_search_state is missing.

This can also be see when running binary_search_tool_tester, the log output from binary_search_state is missing.