This change adds a reserved port for keystone based on the defined
admin port in the variable `keystone_admin_port`.
Please note this task is expected to fail as the current trusty kernel
does not support this action
(https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1279041)
Change-Id: I18ef63747369c6722194b6412fea24fbb248ab1d
Partial-Bug: #1426371
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>