Switch to using Linux run mode on Linux

Author: ekohl

lib/puppet/util/platform.rb

@@ -21,6 +21,11 @@ def solaris?
       end
       module_function :solaris?
 
+      def linux?
+        RUBY_PLATFORM.include?('linux')
+      end
+      module_function :linux?
+
       def default_paths
         return [] if windows?
 

lib/puppet/util/run_mode.rb

@@ -15,6 +15,8 @@ def self.[](name)
         @run_modes ||= {}
         if Puppet::Util::Platform.windows?
           @run_modes[name] ||= WindowsRunMode.new(name)
+        elsif Puppet::Util::Platform.linux?
+          @run_modes[name] ||= LinuxRunMode.new(name)
         else
           @run_modes[name] ||= UnixRunMode.new(name)
         end