Rewrite the agentx code of relayd. This new framework should allow us

to add new objects easier if so desired and should handle a lot more
corner-cases.

This commit should also fix the following:
- On most (all) tables it omits the *Entry elements, making it not map to
  OPENBSD-RELAYD-MIB.txt.
- sstolen returns the size of the sockaddr_in{,6}, instead of the
  sin{,6}_addr resulting in garbage data to be put in the ip-field.
- relaydSessionPortIn and relaydSessionPortOut are swapped
- relaydSessions only uses relaydSessionIndex, while
  OPENBSD-RELAYD-MIB.txt says it should have 2 indices
- miscellaneous minor things related to the AGENTX-protocol, like wonky
  index handeling and returning NOSUCHINSTANCE where NOSUCHOBJECT
  should be returned, etc.

This commit does remove traps, but it's large enough as is and I intent
on adding it soon(tm). It also deprecates the snmp keyword in favour of
an agentx keyword. The snmp keyword is still available, but will be
removed in the future.

Tweaks and OK denis@ on the relayd parts
Tweaks and OK claudio@ on the agentx parts
"Get it in" deraadt@

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