Small fixes for tests.
Add test for import, export and exchange commands.
Fix broken build with --with-openssl, --with-libgcrypt.

When --with-openssl is used, $openssl is set to the specified path.
Unfortunately, that confuses the OPENSSL conditional which expects it to
be set to "true". The result is that the contents of the openssl/
directory are not built when --with-openssl is used, resulting in
undefined references and a broken build.

In addition, there is a typo in the GCRYPT conditional definition
("grypt" instead of "gcrypt") which means GCRYPT never gets set,
(presumably) breaking builds using libgcrypt.

These regressions were introduced in
9b9230a0a79c670b86f54fadd2807b864ff9d91f.