As the partition table has been modified 'resize2fs_once' service
no longer fulfils its purpose.
That service has been replaced with 'resizefs' systemd service
which extends data partition's size and resizes filesystem too
to fill the whole free unallocated space.
Issues: MEN-2254
Changelog: Title
Signed-off-by: Adam Podogrocki <a.podogrocki@gmail.com>