[Twisted-Python] Work around pyflakes errors

[Adi Roiban]

On 10 March 2014 00:04,  <exarkun at twistedmatrix.com> wrote:
> Cool.  I always forget about the other APIs since `namedAny` works for
> anything. :)  `namedModule` seems like a great fit here.
>
> Jean-Paul

I have implemented a requireModule helper to handle the try/except
ImporError code which would create a lot of code duplication when used
with `namedAny`

https://twistedmatrix.com/trac/ticket/7014

If 7014 is accepted I could go and update existing pyflakes reviews to
use the new code.

-- 
Adi Roiban