[mrtg] disabling BULK operations

[Morty Abzug]

I've got some devices at work that are blocking SNMPv2 BULK
operations.  Devices behind these blocks have gig-e interfaces, so I
need to use the 64-bit counters.  cfgmaker in SNMPv2 mode uses BULK
operations.  Is there any way I can get cfgmaker to do regular
getnext/walk-style operations while still using the 64-bit OIDs?
mrtg-reference documents a way to disable BULK in a generated config,
but that doesn't help with cfgmaker.  It would be nice to be able to
enable a "v2-without-bulk" mode.

Note that I'm also pursuing a fix for the devices doing the
blocking. . .

- Morty