The Glance install guide suggests using 'default' as the
user_domain_name and project_domain_name, whereas the Keystone
install guide, which people would be consulting earlier, instructs
the installer to use 'Default'. Since the name is case-sensitive,
this is causing problems for first-time installers of OpenStack.
Change-Id: Iade47bcd69b7a2a99b990885a0270c962de282a1
Closes-bug: #1747181