Refactor the sslfiles Makefile target for ease of use

The Makefile handling of certificate and keypairs used for TLS testing
had become quite difficult to work with. Adding a new cert without the
need to regenerate everything was too complicated. This patch refactors
the sslfiles make target such that adding a new certificate requires
only adding a .config file, adding it to the top of the Makefile, and
running make sslfiles.

Improvements:
- Interfile dependencies should be fixed, with the exception of the CRL
  dirs.
- New certificates have serial numbers based on the current time,
  reducing the chance of collision.
- The CA index state is created on demand and cleaned up automatically
  at the end of the Make run.
- *.config files are now self-contained; one certificate needs one
  config file instead of two.
- Duplication is reduced, and along with it some unneeded code (and
  possible copy-paste errors).
- all configuration files underneath the conf/ directory.

The target is moved to its own makefile in order to avoid colliding
with global make settings.

Author: Jacob Champion <pchampion@vmware.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/d15a9838344ba090e09fd866abf913584ea19fb7.camel@vmware.com

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