Fix OCPP V2.0 BootNotificationSpec test

Commit 48743c9 changed the
serialization of ZonedDateTime objects, losing the timezone information.

However, the BootNotification test compares the original object against
the serialized and deserialized object, which no longer matches when the
test machine is configured to a local timezone other than UTC.

Fix the test to take timestamps with UTC timezone so that they can match
ZonedDateTime objects resulting from serialization and deserialization.

Author: robert-s-ubi

ocpp-v2_0-test/src/main/java/eu/chargetime/ocpp/test/features/BootNotification.java

@@ -34,6 +34,7 @@ of this software and associated documentation files (the "Software"), to deal
 import eu.chargetime.ocpp.model.basic.types.BootReasonEnumType;
 import eu.chargetime.ocpp.model.basic.types.ChargingStationType;
 import eu.chargetime.ocpp.model.basic.types.RegistrationStatusEnumType;
+import java.time.ZoneOffset;
 import java.time.ZonedDateTime;
 import java.util.UUID;
 
@@ -45,7 +46,7 @@ public BootNotification() {
     feature = new BootNotificationFeature(this);
 
     confirmation = new BootNotificationConfirmation();
-    ZonedDateTime calendar = ZonedDateTime.now();
+    ZonedDateTime calendar = ZonedDateTime.now(ZoneOffset.UTC);
     confirmation.setCurrentTime(calendar);
     confirmation.setInterval(42);
     confirmation.setStatus(RegistrationStatusEnumType.Accepted);