enable metadata to be got and set

lib/mixlib/log.rb

@@ -31,6 +31,7 @@ module Log
     def reset!
       close!
       @logger, @loggers = nil, nil
+      @metadata = {}
     end
 
     # An Array of log devices that will be logged to. Defaults to just the default
@@ -92,6 +93,8 @@ def configured?
       @configured
     end
 
+    attr_accessor :metadata
+
     # Sets the level for the Logger object by symbol.  Valid arguments are:
     #
     #  :trace

lib/mixlib/log/child.rb

@@ -22,6 +22,7 @@ class Child
       include Mixlib::Log::Logging
 
       attr_reader :parent
+      attr_accessor :metadata
       def initialize(parent, metadata = {})
         @parent = parent
         @metadata = metadata

spec/mixlib/log_spec.rb

@@ -213,4 +213,10 @@ def #{method_name}(message)
       expect(Logit.fatal("hello")).to be_nil
     end
   end
+
+  it "should set metadata correctly" do
+    Logit.metadata = { test: "data" }
+    expect(Logit.metadata).to eql({ test: "data" })
+  end
+
 end