Fix problem with logical partition move overwriting EBR (#623630)

Prevent overwriting meta data (Extended Boot Rectors) for logical
partitions by temporarily increasing the size of the logical
partition to encompass all of the space involved in the move
operation.  The libparted library will move the EBR as needed to
permit this to happen.  After the move the logical partition is
set to the proper size.

This fixes bug #623630 - Move logical partition to right yields
invalid partition table on /dev/sda - wrong signature 0