Set vexxhost auth_type to password

There is a bug in sdk that is being fixed that causes auth discovery to
work improperly. Setting auth_type to password works around it.

Change-Id: Id8e8fe82827987660c4dc64bd9cf3d65ffd20cf4

modules/openstack_project/templates/nodepool/clouds.yaml.erb

@@ -46,6 +46,7 @@ clouds:
     region_name: ca-ymq-1
     profile: vexxhost
     api_timeout: 60
+    auth_type: password
     auth:
       username: '<%= @vexxhost_username %>'
       password: '<%= @vexxhost_password %>'