Fix alignment on GPT partition resize

Resize creates GPT partition not alligned to cluster blocksize.

Align end of partition to blocksize (use 1 MB if not specified).

Reference: PSBM-25910
Reference: ploop@992198
Fix GPT partition alignment on ploop init

Not aligned GPT partition created on 'ploop init'.
Incorrect 'end' parameter passed to parted, it should be 'size-1'.

Reference: PSBM-25910
Reference: ploop@992231
Released ploop 1.11

Changelog: see https://openvz.org/Download/ploop/1.11/changes

Signed-off-by: Kir Kolyshkin <kir@openvz.org>