Fix ood hostname in vagrant file

This is needed so that the ansible playbook is correctly
selected based on hostname.

Vagrantfile

@@ -14,7 +14,7 @@ Vagrant.configure("2") do |config|
   config.vm.define "ood" do |ood|
     ood.vm.box = "ravi89/centos7.5"
     ood.vm.box_version = "1"
-    ood.vm.hostname = "ohpc"
+    ood.vm.hostname = "ood"
     ood.vm.network "private_network", ip: "10.1.1.254", virtualbox__intnet: "compute"
     #ohpc.vm.customize ["modifyvm", :id, "--name", "ohpc"]
   end