Ensure all role dependencies are consistently specified

We should always specify the 'scm' and 'version' attribute
for every role we depend upon.

Failure to do so can cause errors in certain 2.x versions
of Ansible.

Change-Id: Ia34cf414a4f60b2d51fcb852db573fa6a90b5672

ansible-role-requirements.yml

@@ -19,6 +19,7 @@
   src: https://git.openstack.org/openstack/openstack-ansible-galera_server
   version: master
 - name: keepalived
+  scm: git
   src: https://github.com/evrardjp/ansible-keepalived
   version: master
 - name: lxc_container_create
@@ -119,4 +120,6 @@
   src: https://git.openstack.org/openstack/openstack-ansible-rsyslog_server
   version: master
 - name: sshd
+  scm: git
   src: https://github.com/willshersystems/ansible-sshd
+  version: master