[QENG-4075] Factor out Vmpooler::DummyStatsd

This makes it visible to lib/vmpooler.rb, as well as putting this dummy
metrics endpoint in its own file for easier discovery.

lib/vmpooler.rb

@@ -12,7 +12,7 @@ module Vmpooler
   require 'yaml'
   require 'set'
 
-  %w( api graphite logger pool_manager vsphere_helper ).each do |lib|
+  %w( api graphite logger pool_manager vsphere_helper statsd dummy_statsd ).each do |lib|
     begin
       require "vmpooler/#{lib}"
     rescue LoadError

lib/vmpooler/dummy_statsd.rb

@@ -0,0 +1,20 @@
+module Vmpooler
+  class DummyStatsd
+    attr_reader :server, :port, :prefix
+
+    def initialize(params = {})
+    end
+
+    def increment(label)
+      true
+    end
+
+    def gauge(label, value)
+      true
+    end
+
+    def timing(label, duration)
+      true
+    end
+  end
+end

lib/vmpooler/statsd.rb

@@ -34,23 +34,4 @@ module Vmpooler
       $stderr.puts "Failure updating timing #{prefix}.#{label} on statsd server [#{server}:#{port}]: #{err}"
     end
   end
-
-  class DummyStatsd
-    attr_reader :server, :port, :prefix
-
-    def initialize(params = {})
-    end
-
-    def increment(label)
-      true
-    end
-
-    def gauge(label, value)
-      true
-    end
-
-    def timing(label, duration)
-      true
-    end
-  end
 end