pfSense

When deleting a VIP check it is not used by OpenVPN

I noticed this when cleaning up VIPs and OpenVPN server when testing for this forum post https://forum.pfsense.org/index.php?topic=92174.0
The system let me delete my test VIP before I deleted the OpenVPN server using, probably not a good thing....

Domain override with multiple authoritative DNS servers

Tell users that this is possible in DNS Resolver and how to achieve it. The code in unbound.inc already supports it and works.
I had asked for this in Redmine feature request #4350 and when I went to look at coding to implement it I found code that already did it....

Allow single interface bridges. Useful with span port option, and when shuffling configuration around.

Few minor text typos

Note that advertise is spelt with an "s" in other places in the GUI, so
making it consistent in services_ntpd - but maybe Americans do spell it
"advertize" these days?

diag_sockets show sockets listening on localhost
this helps pick a free port for services using sockets bound to localhost, and helps determine if the service has at least started and bound the port without needing to go through all 'connected' sockets as well

Fix up Ticket #4504 implementation. Match config style with other areas. Use a config setting to disable, rather than enable, this functionality since it's enabled by default so the tag isn't necessary in the default config. Remove now unnecessary config upgrade code.

Remove array_intersect_key here too, definitely not needed. add to obsoletedfiles

There is no longer any need to restrict protocols for IPv4+IPv6 rules, the appropriate ruleset is generated and problem scenarios that would otherwise break here are prevented by other input validation.

remove dead code, clean up excess white space a bit.

Fixes #4504 use correct key index