Adding XML serializing for classes that are subclasses of SubscriberInfoImpl

[vetss]

1) We need to implement missed XML serializing for subclasses that are serialized inside SubscriberInfoImpl:

• mobility.subscriberInformation.LocationInformationGPRSImpl
• mobility.subscriberInformation.PSSubscriberStateImpl
• mobility.subscriberInformation.GPRSMSClassImpl
• mobility.subscriberInformation.MNPInfoResImpl

and of their subclasses if needed.

2) We have to add unit tests for XML serializing for following primitives:

• mobility/subscriberInformation/AnyTimeInterrogationResponseImpl.java
• mobility/subscriberInformation/SubscriberInfoImpl.java

This is needed to finish of implementation of serializing of anyTimeInterrogation response. (anyTimeInterrogation request is not covered at all)

[vetss]

@knosach What is missed - subitems of PDPContextInfo are not implemented: ExtQoSSubscribed, GPRSChargingID, ChargingCharacteristics, Ext2QoSSubscribed, Ext3QoSSubscribed, Ext4QoSSubscribed, ExtPDPType we need a serialization of subitems details not just a byte[] serializing (now only as byte[] implemented - check my commit for examples)

[knosach]

closed by commits above