Some potential errors from PyDev code checker about webiopi HOT 3 CLOSED

Thanks for this feedback.

coap.py:
Not, this is not a error, this is some kind of "static" method which not need 
instance.

bus.py:
oops, yes, this is right.

rest.py:
right too.

utils.py:
e is supposed to be filled with the exception, it's not used here.
actually, exception handling is little different in python 2 and 3 for passing 
exception.
if think this is correct in python 2.
i will correct this by removing e, as it's not used.

thanks

This issue was closed by revision r886.

Issue 26 has been merged into this issue.