tls: kernel TLS support

Software implementation of transport layer security, implemented using ULP
infrastructure.  tcp proto_ops are replaced with tls equivalents of sendmsg and
sendpage.

Only symmetric crypto is done in the kernel, keys are passed by setsockopt
after the handshake is complete.  All control messages are supported via CMSG
data - the actual symmetric encryption is the same, just the message type needs
to be passed separately.

For user API, please see Documentation patch.

Pieces that can be shared between hw and sw implementation
are in tls_main.c

Signed-off-by: Boris Pismenny <[email protected]>
Signed-off-by: Ilya Lesokhin <[email protected]>
Signed-off-by: Aviad Yehezkel <[email protected]>
Signed-off-by: Dave Watson <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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