don't set Vagrant box hostname to overcome problem on vivid64.

Author: steenzout

tests/Vagrantfile

@@ -24,7 +24,6 @@ Vagrant.configure('2') do |config|
     config.vm.define box_name do |host|
 
       host.vm.box = box_settings['box'] unless not box_settings.key? 'box'
-      host.vm.hostname = box_name
 
       host.vm.network box_settings['network']['name'], ip: box_settings['network']['ip'] unless box_settings.key? 'network'