Restart API endpoint

Redis configuration added to backend method
Manager instance now restarts
Logger included in metrics
Spec test added
API doc updated

spec/integration/api/restart_spec.rb

@@ -0,0 +1,30 @@
+require 'spec_helper'
+require 'rack/test'
+
+describe Vmpooler::API::Restart do
+  include Rack::Test::Methods
+
+  def app()
+    Vmpooler::API
+  end
+
+  # Added to ensure no leakage in rack state from previous tests.
+  # Removes all routes, filters, middleware and extension hooks from the current class
+  # https://rubydoc.info/gems/sinatra/Sinatra/Base#reset!-class_method 
+  before(:each) do
+    app.reset!
+  end
+
+
+
+  describe '/restart' do  
+
+    it 'returns OK' do
+      get "/restart"
+      
+      expect(last_response.status).to eq(200)
+      result = JSON.parse(last_response.body)
+      expect(result).to eq({'ok' => true})
+    end 
+  end  
+end