Use .cnf for config files, not .conf

The default is openssl.cnf The project seems to prefer xxx.conf these
days, but we should use the default convention.

Rename all foo.conf (

Use .cnf for config files, not .conf

The default is openssl.cnf The project seems to prefer xxx.conf these
days, but we should use the default convention.

Rename all foo.conf (except for Configurations) to foo.cnf

Fixes #11174

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11176)

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