Add TlsRecordHandler base data handler
Add TlsRecordHandler base data handler

TlsRecordHandler handles buffering of TlsRecords in a connection,
handlers that want to do things based on records (eithe passive or
replacing records) can extend this class and implement on_tls_request
and on_tls_response.

In active TlsRecordHandlers these two methods return the _bytes_ to sent
on the wire in the place of the provided record. This allows you to send
completely different records, inject your own,  or modify the incomin
record arbitrarily.

google/nogotofail,joshcooper/nogotofail,mkenne11/nogotofail-pii,mkenne11/nogotofail,joshcooper/nogotofail,mkenne11/nogotofail,google/nogotofail,mkenne11/nogotofail-pii