wsgi.BaseApplication and wsgi.Router factories should use **kwargs

Also removed wrong references to nova in docstrings.

This is related with bug 1190978

Change-Id: I1b945596d4ebe39d03069b590b7f1a444eaef72f
Python 3.x compatible use of print

Use print in a style that looks as a print
function to Python 3.x.

Change-Id: I3c7a4e7a1b9a519cc1c369a9ec6a1e3da1211394
Merge "wsgi.BaseApplication and wsgi.Router factories should use **kwargs"
Merge "Python 3.x compatible use of print"