Removed principal logging from sample to address #104

Author: sapessi

samples/spring/pet-store/src/main/java/com/amazonaws/serverless/sample/spring/PetsController.java

@@ -37,7 +37,6 @@ public Pet createPet(@RequestBody Pet newPet) {
 
     @RequestMapping(path = "/pets", method = RequestMethod.GET)
     public Pet[] listPets(@RequestParam("limit") Optional<Integer> limit, Principal principal) {
-        System.out.println(principal.getName());
         int queryLimit = 10;
         if (limit.isPresent()) {
             queryLimit = limit.get();