hosts/redhat: recognize Korora [GH-2869]

CHANGELOG.md

@@ -46,6 +46,7 @@ IMPROVEMENTS:
     plugins.
   - commands/plugin: `vagrant plugin install` can now install multiple
     plugins.
+  - hosts/redhat: Recognize Korora OS. [GH-2869]
   - synced\_folders/nfs: If the guest supports it, NFS clients will be
     automatically installed in the guest.
 

plugins/hosts/redhat/host.rb

@@ -11,8 +11,9 @@ module VagrantPlugins
         if release_file.exist?
           release_file.open("r:ISO-8859-1:UTF-8") do |f|
             contents = f.gets
-            return true if contents =~ /^Fedora/ # Fedora
             return true if contents =~ /^CentOS/ # CentOS
+            return true if contents =~ /^Fedora/ # Fedora
+            return true if contents =~ /^Korora/ # Korora
 
             # Oracle Linux < 5.3
             return true if contents =~ /^Enterprise Linux Enterprise Linux/