Convert config.vm.hostname to string [GH-1999]

CHANGELOG.md

@@ -6,6 +6,7 @@ BUG FIXES:
     so that separator replacement works properly.
   - Use `--color=false` for no color in Puppet to support older
     versions properly. [GH-2000]
+  - Make sure the hostname configuration is a string. [GH-1999]
 
 ## 1.2.6 (July 26, 2013)
 

plugins/kernel_v2/config/vm.rb

@@ -242,6 +242,7 @@ module VagrantPlugins
         @box_download_insecure = false if @box_download_insecure == UNSET_VALUE
         @guest = nil if @guest == UNSET_VALUE
         @hostname = nil if @hostname == UNSET_VALUE
+        @hostname = @hostname.to_s if @hostname
 
         # Set the guest properly
         @guest = @guest.to_sym if @guest