t6302: for-each-ref tests for ref-filter APIs
t6302: for-each-ref tests for ref-filter APIs

Add a test suite for testing the ref-filter APIs used
by for-each-ref. We just intialize the test suite for now.
More tests will be added in the following patches as more
options are added to for-each-ref.

Based-on-patch-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Mentored-by: Christian Couder <58cc993db606fd7043084d51c23db751557f1001@gmail.com>
Mentored-by: Matthieu Moy <fbbe566372a364dbd17bce4222f8e1855291903f@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <f21e23168db91f2bd3ec812184a2ac51d05a196a@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git