Revert role SHA pin for Newton-3 development
Revert role SHA pin for Newton-3 development

The changes in https://review.openstack.org/347713 were implemented
in order to pin all roles for the Newton-2 deliverable.

This patch unpins the role requirements in order to continue
development work towards Newton-3.

Change-Id: Ia6adc88b0080ccc4336401553f426c4de599f935

openstack/openstack-ansible,stackforge/os-ansible-deployment,BjoernT/os-ansible-deployment,yanyao/newton,Logan2211/openstack-ansible,yanyao/openstack-ansible,weezer/openstack-ansible,stackforge/os-ansible-deployment,cfarquhar/openstack-ansible,openstack/openstack-ansible,cloudnull/os-ansible-deployment,cfarquhar/openstack-ansible,robb-romans/openstack-ansible,robb-romans/openstack-ansible,BjoernT/os-ansible-deployment,yanyao/openstack-ansible,weezer/openstack-ansible,BjoernT/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/openstack-ansible,Logan2211/openstack-ansible,bunchc/openstack-ansible,yanyao/newton,bunchc/openstack-ansible,os-cloud/os-ansible-deployment,os-cloud/os-ansible-deployment,BjoernT/os-ansible-deployment