Remove unused delayed health check API (#992)

* Remove unused delayed health check API

* Fix test

ngrinder-controller/src/main/java/org/ngrinder/home/controller/HealthCheckApiController.java

@@ -64,19 +64,4 @@ public Map<String, Object> healthCheck(HttpServletResponse response) {
 		map.put("regions", regionService.getAll());
 		return map;
 	}
-
-	/**
-	 * Return health check message with 1 sec delay. If there is shutdown lock,
-	 * it returns 503. Otherwise, it returns region lists.
-	 *
-	 * @param sleep    in milliseconds.
-	 * @param response response
-	 * @return region list
-	 */
-	@GetMapping("/check/healthcheck_slow")
-	public Map<String, Object> healthCheckSlowly(@RequestParam(value = "delay", defaultValue = "1000") int sleep,
-												HttpServletResponse response) {
-		ThreadUtils.sleep(sleep);
-		return healthCheck(response);
-	}
 }

ngrinder-controller/src/test/java/org/ngrinder/home/controller/HomeControllerTest.java

@@ -65,8 +65,7 @@ public void testHome() {
 	@Test
 	public void testHealthCheck() {
 		MockHttpServletResponse res = new MockHttpServletResponse();
-		healthCheckApiController.healthCheck(res);
-		Map<String, Object> message = healthCheckApiController.healthCheckSlowly(500, res);
+		Map<String, Object> message = healthCheckApiController.healthCheck(res);
 		assertEquals(message.get("current"), regionService.getCurrent());
 	}