allow concurrency to be used in development mode

spec/foreman/cli_spec.rb

@@ -19,7 +19,7 @@ describe "Foreman::CLI" do
 
       it "runs successfully" do
         dont_allow(subject).error
-        mock.instance_of(Foreman::Engine).start
+        mock.instance_of(Foreman::Engine).start({})
         subject.start
       end
     end

spec/foreman/engine_spec.rb

@@ -33,7 +33,8 @@ describe "Foreman::Engine" do
   describe "execute" do
     it "runs the processes" do
       write_procfile
-      mock(subject).run(subject.processes["alpha"], false)
+      mock(subject).fork(subject.processes["alpha"])
+      mock(subject).watch_for_termination
       subject.execute("alpha")
     end
   end