guests/linux: LANG=en for ifconfig [GH-3029]

CHANGELOG.md

@@ -75,6 +75,8 @@ BUG FIXES:
   - commands/rsync-auto: Interrupt exits properly. [GH-3552]
   - commands/rsync-auto: Run properly on Windows. [GH-3547]
   - communicators/ssh: Detect if `config.ssh.shell` is invalid. [GH-3040]
+  - guests/linux: For `read_ip_address` capability, set `LANG=en` so
+      it works on international systems. [GH-3029]
   - providers/virtualbox: VirtalBox detection works properly again on
       Windows when the `VBOX_INSTALL_PATH` has multiple elements. [GH-3549]
   - providers/virtualbox: Forcing MAC address on private network works

plugins/guests/linux/cap/read_ip_address.rb

@@ -3,7 +3,7 @@ module VagrantPlugins
     module Cap
       class ReadIPAddress
         def self.read_ip_address(machine)
-          command = "ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1 }'"
+          command = "LANG=en ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1 }'"
           result  = ""
           machine.communicate.execute(command) do |type, data|
             result << data if type == :stdout