adding validation exception handler

Author: slorello89

autoscaler/redis-cloud-autoscaler/src/main/java/com/redis/autoscaler/ValidationExceptionHandler.java

@@ -1,6 +1,5 @@
 package com.redis.autoscaler;
 
-import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.MethodArgumentNotValidException;