Fix the construction of the bugzilla URL

The current implementation overwrites the URI path with "/index.cgi"  This does not work if the URI to bugzilla is not at the root of the server, e.g.:

http://devserver.com/bugzilla

would be changed to:

http://devserver.com/index.cgi

instead of

http://devserver.com/bugzilla/index.cgi

Updated the code to concatenate /index.cgi to the path already specified in the URI rather than overwriting it.