Instead, send random bytes, unless SSL_SEND_{CLIENT,SERVER}RANDOM_MODE
is set.

This is a forward-port of commits:
  4af793036f6ef4f0a1078e5d7155426a98d50e37
  f4c93b46edb51da71f09eda99e83eaf193a33c08
  3da721dac9382c48812c8eba455528fd59af2eef
  2583270191a8b27eed303c03ece1da97b9b69fd3

While the gmt_unix_time record was added in an ostensible attempt to
mitigate the dangers of a bad RNG, its presence leaks the host's view
of the current time in the clear.  This minor leak can help
fingerprint TLS instances across networks and protocols... and what's
worse, it's doubtful thet the gmt_unix_time record does any good at
all for its intended purpose, since:

    * It's quite possible to open two TLS connections in one second.

    * If the PRNG output is prone to repeat itself, ephemeral
      handshakes (and who knows what else besides) are broken.

Extend SSL_CONF to return command value types.

Add certificate and key options.

Update documentation.

The function gettimeofday() is not supported on all platforms. Use
more portable versions. Adapted from FIPS code.

Removing RSA+MD5 from the default signature algorithm list
prevents its use by default.

If a broken implementation attempts to use RSA+MD5 anyway the sanity
checking of signature algorithms will cause a fatal alert.

Suggested by: Anton Blanchard

Latest MIPS ISA specification declared 'branch likely' instructions
obsolete. To makes code future-proof replace them with equivalent.

Excessive fragmentation put additional burden (of addtional MAC
calculations) on the other size and limiting fragments it to 1KB
limits the overhead to ~6%.

PR: 3139

Improve decrypt performance by 10-20% depending on platform. Thanks
to Jussi Kivilinna for providing valuable hint. Also thanks to Ard
Biesheuvel.

Submitted by: Yuriy Kaminskiy

PR: 3130