Bug 8649: Add unit test for C4::Search

Bug 8649: Add unit test for C4::Search

This patch adds a unit test for C4::Search in t/db_dependent. In order
to test the functioning of the Zebra search, this patch actually includes
an entire Zebra sandbox, and pre-indexed files, which are stored in
t/db_dependent/data (the configuration files are generated on the fly).

This test depends on Test::Warn, Test::MockModule, and DBD::Mock.

To test:
1) Run the test. There should be no failures, and no warnings.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: wajasu <matted-34813@mypacks.net>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>