bnc#885825: Handle ODF import and export of data label border properties.

Change-Id: Ic8c7bc873768008537cd52a3fd4b11031b403139
(cherry picked from commit 6c2c974dd3f0b21a23bc3bc5560487d28bbe0fad)
Reviewed-on: https://gerrit.libreoffice.org/10563
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>