We were kinda sorta using a mix of $disabled{"static-engine" and
$disabled{"dynamic-engine"} in Configure.  Let's avoid confusion,
choose one of them and stick to it.
Reviewed-by: NRich Salz <rsalz@openssl.org>

They depend on this feature because they use the engine ossltest,
which is only available as a dynamic engine.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Adapted from BoringSSL. Added a test.

The extension parsing code is already attempting to already handle this for
some individual extensions, but it is doing so inconsistently. Duplicate
efforts in individual extension parsing will be cleaned up in a follow-up.
Reviewed-by: NStephen Henson <steve@openssl.org>

If the environment variable HARNESS_ACTIVE isn't defined or
HARNESS_VERBOSE is defined, it's probable that lots of output is
desired.
Reviewed-by: NRich Salz <rsalz@openssl.org>

To be able to run tests when we've built in a directory other than
the source tree, the testing framework needs a few adjustments.

test/testlib/OpenSSL/Test.pm needs to know where it can find
shlib_wrap.sh, and a number of other tests need to be told a different
place to find engines than what they may be able to figure out on
their own.  Relying to $TOP is not enough, $SRCTOP and $BLDTOP can be
used as an alternative.

As part of this change, top_file and top_dir are removed and
srctop_file, bldtop_file, srctop_dir and bldtop_dir take their place.
Reviewed-by: NBen Laurie <ben@openssl.org>

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Make sure they detect that.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>