Default vagrant deployment to AIO

The default for kolla-ansible is already AIO, let's be consistent.

Partially-Implements: blueprint vagrant-improvements
Change-Id: Ib2736806c373f18be7d758c06b88abe38a60bd55

vagrant/Vagrantfile

@@ -10,7 +10,7 @@ BASE_IMAGE="centos/7"
 PROVIDER="libvirt"
 
 # Whether to do Multi-node or All-in-One deployment
-MULTINODE=true
+MULTINODE=false
 
 # The following is only used when deploying in Multi-nodes
 NUMBER_OF_CONTROL_NODES=3