Add method to "reset" an existing webtask back to clean state, so that it can be reused as for dataset snapshots. This was one of the reasons that imaging progress modal was not slightly messed up for datasets.
Add method to "reset" an existing webtask back to clean state, so
that it can be reused as for dataset snapshots. This was one of the
reasons that imaging progress modal was not slightly messed up for
datasets.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome