Merge commit 'd7e2483' into dtls

* commit 'd7e2483': (57 commits)
  Skip signature_algorithms ext if PSK only
  Fix bug in ssl_client2 reconnect option
  Cosmetics in ssl_server2
  Improve debugging message.
  Fix net_usleep for durations greater than 1 second
  Use pk_load_file() in X509
  Create ticket keys only if enabled
  Fix typo in #ifdef
  Clarify documentation a bit
  Fix comment on resumption
  Update comment from draft to RFC
  Use more #ifdef's on CLI_C and SRV_C in ssl_tls.c
  Add recursion.pl to all.sh
  Allow x509_crt_verify_child() in recursion.pl
  Set a compile-time limit to X.509 chain length
  Fix 3DES -> DES in all.sh (+ time estimates)
  Add curves.pl to all.sh
  Rework all.sh to use MSan instead of valgrind
  Fix depends on individual curves in tests
  Add script to test depends on individual curves
  ...

Conflicts:
	CMakeLists.txt
	programs/ssl/ssl_client2.c