guests/photon: Use require_relative and double quotes

plugins/guests/photon/guest.rb

@@ -1,6 +1,6 @@
 module VagrantPlugins
   module GuestPhoton
-    class Guest < Vagrant.plugin('2', :guest)
+    class Guest < Vagrant.plugin("2", :guest)
       def detect?(machine)
         machine.communicate.test("cat /etc/photon-release | grep 'VMware Photon Linux'")
       end

plugins/guests/photon/plugin.rb

@@ -1,28 +1,28 @@
-require 'vagrant'
+require "vagrant"
 
 module VagrantPlugins
   module GuestPhoton
-    class Plugin < Vagrant.plugin('2')
+    class Plugin < Vagrant.plugin("2")
-      name 'VMware Photon guest'
+      name "VMware Photon guest"
-      description 'VMware Photon guest support.'
+      description "VMware Photon guest support."
 
-      guest('photon', 'linux') do
+      guest("photon", "linux") do
-        require File.expand_path("../guest", __FILE__)
+        require_relative "guest"
         Guest
       end
 
-      guest_capability('photon', 'change_host_name') do
+      guest_capability("photon", "change_host_name") do
-        require_relative 'cap/change_host_name'
+        require_relative "cap/change_host_name"
         Cap::ChangeHostName
       end
 
-      guest_capability('photon', 'configure_networks') do
+      guest_capability("photon", "configure_networks") do
-        require_relative 'cap/configure_networks'
+        require_relative "cap/configure_networks"
         Cap::ConfigureNetworks
       end
 
-      guest_capability('photon', 'docker_daemon_running') do
+      guest_capability("photon", "docker_daemon_running") do
-        require_relative 'cap/docker'
+        require_relative "cap/docker"
         Cap::Docker
       end
     end