[PATCH] Make the function in getActualSize and lvm_dialog_gui.py the same.

[Joel Granados Moreno <jgranado redhat com>]

Hi list.

As discussed with Radek, I added some changes to the getActualSize
funciton in the VolumeGroupRequestSpec class.  This will make the
function in lvm_dialog_gui.py equal to the one in the VG request.  I
know that the code could have probably been reduced to one function and
for that function to be called from the VG request and the lvm dialog.
But I chose to change the code as little as possible (since this is RHEL5)

Tested in the usual lvm partitioning cases and it seems to work just fine.

Regards.