Unit test for .doc import of full colour borders

This test exercises the import component of commit
ad51d4952dc30e0d1cdcc6037556cd7c66a61542 which adds support for full
colour borders in .doc import/export.

Also this test showed that page border import was not actually covered
by ad51d4952dc30e0d1cdcc6037556cd7c66a61542, so that omission is fixed
here.

Change-Id: I6272e9b22415b5af012145e99360c5765d5aec60
Reviewed-on: https://gerrit.libreoffice.org/8759
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>