libfdisk: change the way how apply user device properties

libfdisk: change the way how apply user device properties

The current code calls fdisk_apply_user_device_properties() after
label probing, because we want to overwrite label geometry by user
settings (e.g. -C -H -S fdisk options).

Unfortunately, this way does not work if we need to use a different
sector size, because label probing depends on sector size... So, the
right way is to apply user setting to the fdisk context before we
start to read from device, and overwrite geometry again after label is
already read. Fortunately, this shit is necessary only rarely and for
SUN and SGI disk labels.

Addresses: https://github.com/karelzak/util-linux/issues/396
Signed-off-by: Karel Zak <kzak@redhat.com>