[Bro] modifying bro.init

[daniela.miao at utoronto.ca]

Hi Everyone,

Thanks for your help before. I found that the DNS parser was giving me  
trouble due to many of the IP checksum errors. I don't really care  
much about these errors anyways.

I understand the boolean value of ignore_checksum is set to False in  
bro.init, do I just modify this file? A quick read through the wiki  
page tells me no, but I'm not sure exactly where to continue to.

I apologize if the issue seems trivial, I'm just starting to get the  
hang of the language.

Thank you,

Daniela