Set external roles to import into ansible namespace

This patch sets the ansible external roles to export into the ansible
namespace (/etc/ansible/roles) instead of the os-ansible-deployment namespace.

This ensures a seperation of concerns and simplifies the os-ansible-deployment
upgrade process.

Partially implements: blueprint master-kilofication
Change-Id: I96dd61a4d3bdc52ae577fbf006387ffac58b7875

scripts/bootstrap-ansible.sh

@@ -77,7 +77,6 @@ if [ -f "${ANSIBLE_ROLE_FILE}" ];then
     fi
     # Pull all required roles.
     ansible-galaxy install --role-file=${ANSIBLE_ROLE_FILE} \
-                           --roles-path=playbooks/roles/ \
                            --ignore-errors \
                            --force
 fi