I'll just share how I managed to get the three components working.

Keystone and Horizon is very straight forward if you follow through the quick start guide in

http://keystone.openstack.org

and

http://horizon.openstack.org

However, Nova isn't that simple.

I read the manuals in the wiki but they are pretty much obsolete. I am suspicious about whatever is shown there even if the content is correct.

So I had to read through the code to get a grip of what is actually happening inside.

You should read the flags.py, nova.conf, and api-paste.ini from start to end if you wish to get it work with keystone.

I went through the major packages of nova and used basic .conf and .ini file and launched it.

Whatever error message I got after, I searched through launchpad.

Guess this isn't much help but at least now you know there is no comprehensive manual to rely on.