COOK-4010: Check for service_running? should be more specific

- Check the result of the bluepill status command for up instead of an exit code (status seems to always return a 0 exit code).
- Changed the test so that it creats a deamonized process instead of a process that never actually starts and stays up.
Merge branch 'COOK-4010'

Conflicts:
	test/cookbooks/bluepill_test/files/default/tests/minitest/default_test.rb
	test/cookbooks/bluepill_test/recipes/default.rb
	test/cookbooks/bluepill_test/templates/default/test_app.pill.erb