add basic pld linux support

PLD Linux Distribution: https://www.pld-linux.org/

plugins/guests/linux/guest.rb

@@ -29,6 +29,7 @@ module VagrantPlugins
           return :fedora if comm.test("grep 'Fedora release 1[678]' /etc/redhat-release")
           return :redhat if comm.test("cat /etc/redhat-release")
           return :suse if comm.test("cat /etc/SuSE-release")
+          return :pld if comm.test("cat /etc/pld-release")
           return :arch if comm.test("cat /etc/arch-release")
           return :solaris if comm.test("grep 'Solaris' /etc/release")
         end

plugins/guests/pld/guest.rb

@@ -0,0 +1,13 @@
+require "vagrant"
+
+require Vagrant.source_root.join("plugins/guests/redhat/guest")
+
+module VagrantPlugins
+  module GuestPld
+    class Guest < VagrantPlugins::GuestRedHat::Guest
+      def network_scripts_dir
+        '/etc/sysconfig/interfaces/'
+      end
+    end
+  end
+end

plugins/guests/pld/plugin.rb

@@ -0,0 +1,15 @@
+require "vagrant"
+
+module VagrantPlugins
+  module GuestPld
+    class Plugin < Vagrant.plugin("2")
+      name "PLD Linux guest"
+      description "PLD Linux guest support."
+
+      guest("pld") do
+        require File.expand_path("../guest", __FILE__)
+        Guest
+      end
+    end
+  end
+end