Exclude create_resources only for Fedora

Added discovering step to prescript so each
step will have information about host operating
system.

Change-Id: Id957a4c7e98ff4201ea26abddea942ba092671ca
Fixes: rhbz#961049
Adds Firewall rules for keystone access.

Allows connection to the keystone service only
for the hosts that need to (basically every
service).

This patch is for keystone only, rules for the other
services are being developed since the bug
addresses the entire openstack installation.

Fixes (partially): rhbz#1002063

Change-Id: I44cf008147bd1f0889e9cc78bda9d67889976c10
Merge "Adds Firewall rules for keystone access."
Merge "Exclude create_resources only for Fedora"