tests: Specify hostname in Vagrantfile

Vagrantfile

@@ -18,4 +18,5 @@ Vagrant.configure("2") do |config|
   config.vm.synced_folder ".", "/vagrant", type: "rsync",
     rsync__exclude: ".git/",
     rsync__args: ["--delete"]
+  config.vm.hostname = "bntest0"
 end