[CORD-2017]
Change mock and single scenario head node VM's from headnode to head1,
making more uniform with physical scenarios and muscle memory

Change-Id: Ia9fa0992235772fe881bd07d08ad6947be047ffe
diff --git a/scenarios/single/Vagrantfile b/scenarios/single/Vagrantfile
index 78a7d21..b8092c8 100644
--- a/scenarios/single/Vagrantfile
+++ b/scenarios/single/Vagrantfile
@@ -16,8 +16,8 @@
   config.vm.synced_folder "../../platform-install/credentials/", "/opt/credentials/", create: true
 
   # set the headnode VM
-  config.vm.define "headnode" do |d|
-    d.vm.hostname = "headnode"
+  config.vm.define "head1" do |d|
+    d.vm.hostname = "head1"
     d.vm.network "forwarded_port", guest: 80, host: 8080, host_ip: '*'
     d.vm.network "private_network",
       ip: settings['head_vm_ip']