added trace_module to debugutils

[kurtbrose]

might be handy to have this in a CLI type interface like stdlib in trace as well

python -m tracemod json socket main.py

[kurtbrose]

Here's some example output:

../keymakeragent\key_client.py _get_app_data 393
../keymakeragent\key_client.py has_app_data 416
../keymakeragent\key_client.py has_app_data 418
../keymakeragent\key_client.py has_app_data 419
../keymakeragent\key_client.py _get_app_data 407
../keymakeragent\key_client.py has_app_data 416
../keymakeragent\key_client.py has_app_data 418
../keymakeragent\key_client.py has_app_data 419
../keymakeragent\key_client.py _get_app_data 412
../keymakeragent\key_client.py _get_by_name_and_version 303
../keymakeragent\key_client.py _get_by_name_and_version 304

It prints out a lot of redundant data, but it is fairly readable because the columns line up -- you can scan past the module and function name.