CORD-1563 Clean up Vagrantfile for CiaB

Change-Id: Ida1704eb1c5c7c695312c1e16ad0d7593251aa6c
diff --git a/ansible/leafswitch.yml b/ansible/leafswitch.yml
index e353fde..2cec18f 100644
--- a/ansible/leafswitch.yml
+++ b/ansible/leafswitch.yml
@@ -1,5 +1,6 @@
-- hosts: localhost
-  remote_user: vagrant
+- name: Set up virtual switch
+  hosts: all
+  become: yes
   serial: 1
   roles:
     - common