Applied naming conventions to Keystone service descriptions

After noticing some inconsistency among Keystone service
descriptions, I applied the naming conventions defined here:

https://wiki.openstack.org/wiki/Documentation/Conventions

Change-Id: Iace29f5fa4d29f93104f34da780d42f6d2f62d8f
Closes-Bug: #1287958
Removed *.ini configuration steps from Nova compute section

Nova in Icehouse doesn't seem to require configuration of *.ini files,
particularly the [filter:authtoken] section. I removed these steps
from the compute section of the Nova chapter. I also added the
'auth_uri' key to the [keystone_authtoken] section in nova.conf.

Change-Id: I2c2e75f1855752a68fec2686a9ff639bef97eacd
Closes-Bug: #1287900
Fix link for training-cluster-scripts

Currently we link to a copy of the scripts on docs.openstack.org - and
that location does not exist.

Instead of putting this data on docs.openstack.org, let's give a
reference to github and distribute it from there.

Change-Id: I4dc7f31a3a50520ccef16db7e4ff0b54d02d89ff
Closes-Bug: #1282874
Modifying the doc to include maven installation instructions from it's own website

Change-Id: Iefb04e4141c88e365cd0dd3c419906e2e649071d
Merge "Removed *.ini configuration steps from Nova compute section"
Merge "Applied naming conventions to Keystone service descriptions"
Merge "Fix link for training-cluster-scripts"
Merge "Modifying the doc to include maven installation instructions from it's own website"