Support mod_nss and mod_ssl from the same config file
mod_ssl uses SSLRequireSSL while mod_nss uses NSSRequireSSL to require
TLS/SSL. Ipsilon used to expect mod_ssl while FreeIPA uses mod_nss. With
new <IfModule mod_nss.c> checks, it is no longer necessary to modify
Ipsilon's Apache config to use mod_nss.
Ipsilon still defaults to mod_ssl as TLS/SSL provider. When mod_nss is
installed, it prefers mod_nss over mod_ssl.
Fixes: #85
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-by: Pierre-Yves Chibon <pingou@pingoured.fr>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>