Issue #4029 exposed two problems when failing to load libpsrpclient.
WSManAPIDataCommon.ctor was not identifying the binary that failed DLLImport; hindering diagnosability
PrioritySendDataCollection.Clear() would throw a NullReferenceException when called from the finalizer after an error path.
This change addresses both of the above:
Guard against null arrays in PrioritySendDataCollection.Clear() - called from finalizer in error paths.
Diagnosability: Log the DllNotFoundException in WSManAPIDataCommon ctor and also include it as the internal exception when throwing PSRemotingTransportException.
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