Debian specifics for keystone

This patch adds Debian specifics for the Keystone install
chapter.

Note that this is a break-down of:
https://review.openstack.org/54394/

into smaller patches.

backport: havana

Change-Id: I9c7383f3daffab06fbe12d35208923eda00b5207
Debian specifics for Glance

This patch adds Debian specifics for Glance, and removes
the parts which aren't needed for Debian (since the
configuration is automated in Debian).

Note that this is a break-down of:
https://review.openstack.org/54394/

into smaller patches.

backport: havana

Change-Id: I72c6f1958c292d86cd328a186d717d7022be59a2
Merge "Debian specifics for keystone"
Merge "Debian specifics for Glance"