[Bro] Install Instructions for gperftools

[Azoff, Justin S]

> On Sep 16, 2015, at 1:36 PM, Hosom, Stephen M <hosom at battelle.org> wrote:
> 
> I believe this is:
>  
> sudo apt-get install libgoogle-perftools-dev
>  

Yeah.. just keep in mind that if you build bro against perftools on the manager, the worker boxes will need the library installed as well.  Otherwise the resulting bro binary will fail to start.

-- 
- Justin Azoff