Replace manual uri constructs with get_uri() (RM#6800)

Replaces manual URI builds with get_uri() for modules identified in RM #6800:
http://dev.metasploit.com/redmine/issues/6800

No presumptions were made about the correctness of anything other than the components which get_uri would directly replace (i.e. potential double slash situations are left as is). This is done to ensure stability of the modules by not changing anything of how they work.

I tested on a number of the modules by running through them for breakage and/or any other unexpected behaviour vs. the originals and identified no issues.