[python-bugzilla] extending command line actions for python-bugzilla

[Jindrich Luza]

Hi

I have suggestion for extending command line actions provided by python-bugzilla cli.
Namely new_component and modify_component is what I'm talking about.
There's already API for modify component and new component in python-bugzilla, but 
command line actions for use these features missing. 

In attachment you can find little patch providing command lines actions mentioned above.