Updates ansible role requirements script name
Updates ansible role requirements script name

This change fixes an issue where the ansible role requirements
script in bootstrap-ansible.sh was referencing a script that no
longer exists.

Old Name:
  scripts/os-ansible-role-requirements.py

New Name:
  scripts/openstack-ansible-role-requirements.py

Change-Id: I80049d0544de6edb8bf4830463d3090c05236209
Closes-Bug: #1501438

git-harry/os-ansible-deployment,weezer/openstack-ansible,os-cloud/os-ansible-deployment,jpmontez/openstack-ansible,cloudnull/os-ansible-deployment,yanyao/openstack-ansible,cfarquhar/openstack-ansible,jpmontez/os-ansible-deployment,weezer/openstack-ansible,yanyao/openstack-deployment-liberty,BjoernT/openstack-ansible,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,yanyao/openstack-deployment-liberty,mrda/openstack-ansible,Logan2211/openstack-ansible,Logan2211/openstack-ansible,yanyao/openstack-ansible,BjoernT/os-ansible-deployment,major/os-ansible-deployment,openstack/openstack-ansible,robb-romans/openstack-ansible,jpmontez/openstack-ansible,open-switch/infra_openstack-ansible,git-harry/os-ansible-deployment,stackforge/os-ansible-deployment,mancdaz/openstack-ansible,bunchc/openstack-ansible,cfarquhar/openstack-ansible,mancdaz/openstack-ansible,bunchc/openstack-ansible,major/openstack-ansible,major/os-ansible-deployment,cloudnull/os-ansible-deployment,openstack/openstack-ansible,robb-romans/openstack-ansible,yanyao/openstack-deployment-liberty,yanyao/newton,open-switch/infra_openstack-ansible,jpmontez/openstack-ansible,mrda/openstack-ansible,os-cloud/os-ansible-deployment,jpmontez/os-ansible-deployment,stackforge/os-ansible-deployment,yanyao/newton,major/openstack-ansible,mrda/openstack-ansible,git-harry/os-ansible-deployment,jpmontez/os-ansible-deployment,open-switch/infra_openstack-ansible,BjoernT/os-ansible-deployment