Update extendlvm script to use LV Path value.
Merge branch 'master' into precise
Revert "Merge branch 'master' into precise"

This reverts commit d57c3f5c9cae4017593fc21a80d8dc77c1f69f47, reversing
changes made to 7dcb85f3267a67348696e2142c187924f8d3c9ff.