Not able to install RHOSP12 on RHEL 7.4

[Anandprakash]

During running packstak 12 on RHEL 7.4 giving following error.

Applying Puppet manifests [ ERROR ]

ERROR : Error appeared during Puppet run: 10.65.207.223_controller.pp
Error: Evaluation Error: Error while evaluating a Resource Statement, Class[Sahara::Notify]: has no parameter named 'enable_notifications' at /var/tmp/packstack/f7c8d7b15a994517a54107a0f93f8c16/modules/packstack/manifests/sahara/ceilometer.pp:3:5 on node dhcp207-223.lab.eng.pnq.redhat.com

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/484652
Committed: https://git.openstack.org/cgit/openstack/packstack/commit/?id=9b2babd9c90af487d43479eaeaeacf03b7904f7f
Submitter: Jenkins
Branch: master

commit 9b2babd9c90af487d43479eaeaeacf03b7904f7f
Author: Alfredo Moralejo <email address hidden>
Date: Tue Jul 18 09:39:49 2017 +0200

    Remove enable_notifications when using sahara::notify

    The parameter has been removed from puppet-sahara in
    https://review.openstack.org/#/c/444051/. Now to enable
    the service the only required parameter is to use
    notification_driver which is already used.

    Change-Id: I6d8d724c61d79d5af9a2f98e3bcf2f449c8a186f
    Closes-Bug: #1704927