This aligns the parameter default values from python-tripleoclient
with tripleo-heat-templates. This is in preparation for removing
all the defaults from the client, and maintaining them only in the
templates.
Change-Id: I7b635a250f1ecc170e18d8e434f0118c6fcbb942 Co-Authored-By: James Slagle <jslagle@redhat.com>