dns/dnsdist: fix rc.d script, add support for LuaJIT and enable some new features

• Really fix the rc.d script to start using daemon(8) and add the --supervised commandline argument (which suppresses opening up the console)
• Enable DNS-over-TLS (upstream suggests enabling both GnuTLS and OpenSSL backends so you can switch in case of a serious security issue in .ie OpenSSL)
• Add OpenSSL support (enabled by default)
• Add GnuTLS support (enabled by default)
• Add dnstap support (disabled by default)
• Add SNMP support (disabled by default)
• Add support for LuaJIT or whatever you set as your default version in make.conf (disabled by default)
• Bump PORTREVISION

PR: 227175
Submitted by: Ralf van der Enden <tremere@cainites.net>
MFH: 2018Q2