ByteStreamCnvSvc: Byte stream metadata adjustments.

Don't crash in ByteStreamEventStorageOutputSvc if there's no 
bytestream metadata.  (Can happen for example if we're reading pool
and writing bytestream.)

In RDP_ByteStream_jobOptions, add EventInfo as an additional dependency
of StreamBS.  (Needed for SCT_RawDataByteStreamCnv tests.)