Revert "Bug #2200: VM Resize uses the same quota mechanism as all the other methods"

This reverts commit 886346606d7ff1d4738987babc907c8ef0e59276.

(cherry picked from commit 9126e8a8f62be6173ef9fe181c3bdb0af57c011d)
bug #2200: Number of VMS can be set in quota del operation. Prevents updating VMS_USED if set to 0 in
update

(cherry picked from commit df4d7db2adc989a72985a83b98f737b055c7cac7)