[BZ 1089108] File Systems -> Free Space graph off by a factor of 1000. This was due to a recent bug fix introduced for BZ1080470.

(cherry picked from commit 251d60aa898402d28338a43bc844a3d69d4aff7d)
[BZ 1089108] File Systems -> Free Space graph off by a factor of 1000. Refactored to a much cleaner solution with no IF logic. Removed some dead code from Measurement helper classes.

(cherry picked from commit a2f0529d82120e069b22c94558d07f9e3a811e44)