Set min-ready=0 for dsvm-precise-krnl

This node type is no longer used.  First set the minimum number of
ready nodes to 0 so that nodepool will clean up any running nodes of
this type.  The next change will remove all remnants of this node
type.

Change-Id: Ia0099db599af8f7b95b7fb6f2973479cdfa49489
Merge "Set min-ready=0 for dsvm-precise-krnl"