Rename OutputRegisterFlowLogger to SCOutputRegisterFlowLogger and
document in the header file.
Mark other functions in the header file as part of the internal API.
Ticket: #7227
Rename OutputRegisterPacketLogger to SCOutputRegisterPacketLogger as
its part of the public API and document its parameters.
Comment on the other functions in the header that they are part of the
internal API.
Ticket: #7227