Don't parse RTDL packets

Removed the code for parsing the RTDL packets.  Also removed the code in
the BankedEventPkt parser that checked the pulse ID on the RDTL packets.

Refs #6932
Merge branch 'feature/6932_Ignore_RTDL_Packets' into develop

Conflicts:
	Code/Mantid/Framework/DataHandling/src/SNSLiveEventDataListener.cpp

Refs #6932