This tests diverse internal KEYMGMT features. The current existing
test checks that evp_keymgmt_export_to_provider() passes the key data
correctly through two instances of the default provider, and that the
resulting numbers at the end match the initial numbers.
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10190)
