Add echo function

Is intended to be used for debugging like this:
$a = 'test'
echo($a, 'My string')
$b = [1,2,3]
echo($b, 'My array')
> 2015/02/10 21:43:26.939: My string (String) "test"
> 2015/02/10 21:43:26.040: My array (Array) ["1", "2", "3"]

Like 'notice' function but better

Change-Id: I0efb98a34b8d955c0703719c534c9dff912dcee9

deployment/puppet/osnailyfacter/lib/puppet/parser/functions/echo.rb

@@ -0,0 +1,41 @@
+require 'time'
+require 'pp'
+Puppet::Parser::Functions::newfunction(:echo, :doc => <<-EOS
+Output the inspected value of the variable and its type.
+Example:
+$a = 'test'
+$b = ["1", "2", "3"]
+$c = {"a"=>"1", "b"=>"2"}
+$d = true
+$f = { "b" => { "b" => [1,2,3], "c" => true, "d" => { 'x' => 'y' }}, 'x' => 'y', 'z' => [1,2,3,4,5,6]}
+$g = 12345
+echo($a, 'My string')
+echo($b, 'My array')
+echo($c, 'My hash')
+echo($d, 'My boolean')
+echo($e, 'My undef')
+echo($f, 'My structure')
+echo($g) # no comment here
+
+2015/02/10 21:53:11.067: My string (String) "test"
+2015/02/10 21:53:11.067: My array (Array) ["1", "2", "3"]
+2015/02/10 21:53:11.067: My hash (Hash) {"a"=>"1", "b"=>"2"}
+2015/02/10 21:53:11.067: My boolean (TrueClass) true
+2015/02/10 21:53:11.068: My undef (String) ""
+2015/02/10 21:53:11.068: My structure (Hash) {"b"=>{"b"=>["1", "2", "3"], "c"=>true, "d"=>{"x"=>"y"}},
+ "x"=>"y",
+ "z"=>["1", "2", "3", "4", "5", "6"]}
+2015/02/10 21:53:11.068: (String) "12345"
+EOS
+) do |argv|
+  value = argv[0]
+  comment = argv[1]
+  timestamp = Time.now.strftime("%Y/%m/%d %H:%M:%S.%3N")
+  message = "(#{value.class}) #{value.pretty_inspect}"
+  if comment
+    message = "#{comment} #{message}"
+  end
+  message = "#{timestamp}: #{message}"
+  puts message
+end
+