OPNSense/core 5ad2c28src/etc/ssl opnsense.cnf, src/www system_certmanager.php

Add option to create combined client and server certificate, closes #2800 (#3130)

(cherry picked from commit ea8dce33ba8db5b71683bd582ac42f1b103801d4)
(cherry picked from commit d8579502b71be44b4bc0ac0ca7144cbecf6ae2d3)
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+12-89src/etc/ssl/opnsense.cnf
+1-0src/www/system_certmanager.php
+13-892 files

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