Fix 'outset' and 'inset' table border type import in DOCX and RTF

In the past, LO did not support 'outset' and 'inset' border types
for tables, so when encountering them - LO converted them to other
types of border. Now that LO supports it - DOCX and RTF filters
were changed to import these border types correctly.
DOC filter was not changed, because creating a proper DOC sample
file that has these border types (needed for the 'bordertest.hxx'
file) was not possible right now. So at least DOCX and RTF filters
are fixed.

Change-Id: Ida2449d45a0ac138388f3cbfeb41657db1d4cda9
Signed-off-by: Michael Stahl <mstahl@redhat.com>