Bug 15947: move SIPILS.t to DB-dependent test directory

 Bug 15947: move SIPILS.t to DB-dependent test directory

SIPILS.t requires an active koha-conf.xml to pass,
and consequently is moved to t/db_dependent so that
'make test' can succeed.

To test
-------
[1] Unset KOHA_CONF and either do a make test or a
    prove -v t/SIPILS.t.  Note that the tests fail.
[2] Apply the patch and run make test again; this time,
    the test suite should pass.
[3] Verify that with KOHA_CONF *set*,
    prove -v t/db_dependent/SIPILS.t passes.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>