PyKF5 bindings generator improvements out for review.

[Stephen Kelly]

Stephen Kelly wrote:

> Simple, short and noiseless commits are easy to review, so please see if
> you can follow suit there.

In particular, I tried to review the commit "Rule database structure 
changes", but it seems to contain lots of unrelated things such as 
outputting 'discarded' instead of 'suppressed', and lots more. That is all 
noise and makes the commit hard to review.

Please reduce that commit to the change in rules_SipTest.py plus whatever 
minimum change is needed to the python code to support that. The rest of the 
changes can either be follow-ups or can appear before the API change commit.

Thanks,

Steve.