these do the obvious. Takes a list of lanids (not vlanids). So yesterday
when I did the switchover from the 1Gb to the 10Gb link I did this:

  snmpit_test -i procurveA -i procurve1 --clearvlanontrunks 1225665 1270247 ...

which removed the vlans from the trunk ports on procurve1 and procurveA.
Then I changed the wires table, and then I did:

  snmpit_test -i procurveA -i procurve1 --setvlanontrunks 1225665 1270247 ...

which added the vlans to the new trunk ports. Nifty.