* peterdmv/ssl/fix-handshake-hello/ERL-975/OTP-15888:
  ssl: Fix negative tests in ssl_basic_SUITE
  ssl: Fix run_client_error/1 in ssl_test_lib
  ssl: Fix ssl_handshake:extension_value/1

* peterdmv/ssl/tls12-java11-interop/ERL-973/OTP-15887:
  ssl: Add interop test
  ssl: Improve handling of signature algorithms

* john/kernel/fix-io-proto-user-drv/OTP-15805:
  kernel: Force synchronous port_commands in user/user_drv

* ingela/ssl/handshake-handling/ERL-968/OTP-15879:
  ssl: Correct handshake handling

Fix run_client_error/1 to properly propagate errors from the
test client.

Handle new TLS 1.2/1.3 extensions.

Add interoperability test for TLS 1.2 server and TLS 1.3 client.

TLS 1.2 ClientHello caused handshake failure in the TLS 1.2 server
if the signature_algorithms_cert extension contained legacy algorithms.

Update TLS 1.2 server to properly handle legacy signature algorithms
in the signature_algorithms_cert extension.

Update TLS 1.3 client so that it can send legacy algorithms in its
signature_algorithms_cert extension.