Multi distro support for openstack_project base.

Minor updates the openstack_project to support
both Ubuntu and RHEL.

Change-Id: I335addab52224c3fdb17a79e77e7aa3bc505b085
Reviewed-on: https://review.openstack.org/23296
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
Update ssh module to support RHEL.

Parameterizes the ssh module so that it supports both Ubuntu and
RHEL.

Change-Id: I9163e2f41d9a25df5f757592e642073fc19001f5
Reviewed-on: https://review.openstack.org/23299
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins