This adds an async IO test. There are two test runs. The first one does
a normal handshake with lots of async IO events. The second one does the
same but this time breaks up all the written records into multiple records
of one byte in length. We do this all the way up until the CCS.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

The test program clienthello checks TLS extensions, so there's no
point running it when no TLS protocol is available.
Reviewed-by: NBen Laurie <ben@openssl.org>

Some tests were copied from test_jpake, but the title wasn't changed
accordingly.  This might seem like a small thing, but it does affect
the log file name...
Reviewed-by: NRich Salz <rsalz@openssl.org>

test_clienthello
test_packet
test_verify_extra
test_secmem
Reviewed-by: NRich Salz <rsalz@openssl.org>

Very simple test recipes easily become tedious, so they might benefit
from being made as simple as possible.  Therefore, OpenSSL::Test::Simple
is born.  It currently provides but one function, simple_test(), which
takes a minimum of two parameters (test name and program to run), with
the optional third, being the algorithm to be checked for before
running the test itself.

All recipes with that simple thing to do have been rewritten to be as
minimal as possible.
Reviewed-by: NRich Salz <rsalz@openssl.org>

These recipes all correspond to a compiled test program.
Reviewed-by: NRich Salz <rsalz@openssl.org>

The math recipes are among the heavier, but also quite important.
For the BN test, we have previously relied on bc to verify the numbers.
Unfortunately, bc doesn't exist everywhere, making tests on some platforms
rather painful.  With the new recipe (recipes/10-test_bn.t), we rely
on perl's Math::BigInt and a homegrown simple calculator (recipes/bc.pl)
that can do enough to cover for bc.
Reviewed-by: NRich Salz <rsalz@openssl.org>