Rework how providers/fipsmodule.cnf is produced

Rework how providers/fipsmodule.cnf is produced

First of all, we have concluded that we can calculate the integrity
checksum with a simple perl script.

Second, having the production of providers/fipsmodule.cnf as a
dependency for run_tests wasn't quite right.  What we really want is
to generate it as soon as a new providers/fips.so is produced.  That
required a small bit of fiddling with how diverse dependencies are
made.

Fixes #15166

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15436)