Use Python 3.x compatible print syntax
Use Python 3.x compatible print syntax

Adding an extra pair of braces helps here to
let Python 3.x interpret it as print function,
while not confusing the Python 2.x print operator.

Change-Id: I05af267ecfbcc80753726743fdf82c330350afcb

citrix-openstack-build/keystoneauth,jamielennox/keystoneauth,sileht/keystoneauth