test: fix test failures in ActionEventInterceptorTest (#8938)

* test: fix test failures in ActionEventInterceptorTest

```
Error:  Failures:
Error:    ActionEventInterceptorTest.testInterceptComplete:247
Error:    ActionEventInterceptorTest.testInterceptException:261
Error:    ActionEventInterceptorTest.testInterceptStartAsync:234 expected:<Starting VM[.  Id: 0 Name: null]> but was:<Starting VM[]>
```

* Update 8938: move CallContext.unregister as well

server/src/test/java/com/cloud/event/ActionEventInterceptorTest.java

@@ -172,6 +172,7 @@ public EventVO answer(InvocationOnMock invocation) throws Throwable {
         account.setId(ACCOUNT_ID);
         user = new UserVO(1, "testuser", "password", "firstname", "lastName", "email", "timezone",
                 UUID.randomUUID().toString(), User.Source.UNKNOWN);
+        CallContext.register(user, account);
 
         Mockito.when(accountDao.findById(ACCOUNT_ID)).thenReturn(account);
     }
@@ -197,6 +198,8 @@ public void teardown() {
 
         utils.init();
 
+        CallContext.unregister();
+
         componentContextMocked.close();
     }
 
@@ -265,7 +268,6 @@ public void testInterceptException() throws NoSuchMethodException {
 
     @Test
     public void testInterceptExceptionResource() throws NoSuchMethodException {
-        CallContext.register(user, account);
         Long resourceId = 1L;
         ApiCommandResourceType resourceType = ApiCommandResourceType.VirtualMachine;
         CallContext.current().setEventResourceId(resourceId);
@@ -282,7 +284,6 @@ public void testInterceptExceptionResource() throws NoSuchMethodException {
         Assert.assertEquals(eventVO.getState(), com.cloud.event.Event.State.Completed);
         Assert.assertEquals(eventVO.getResourceId(), resourceId);
         Assert.assertEquals(eventVO.getResourceType(), resourceType.toString());
-        CallContext.unregister();
     }
 
     @Test