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

This reverts commit ac8d74c29c6313711f6d40712eb3a64d09d8304c, reversing
changes made to 0556d0cd0f39c864a87ad1ad8ee79c736031755b.