extract tls key information
extract tls key information

See the following commit in the monitor. It goes into more details about
this feature. One extra layer of glue code is required to actually write
the master secret key file.

1f40244a265b3b51107c5ab0138f66778ffcb753

cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo