Bug 10298: Adapt existing code

Bug 10298: Adapt existing code

set_solr and set_zebra is not really useful. It is preferable to use
mock_preference directly.

To test:
1/ Launch Solr
2/ prove -r t/searchengine/
It should produce:
% prove -r t/searchengine/
t/searchengine/000_conn/conn.t ........... ok
t/searchengine/001_search/search_base.t .. ok
t/searchengine/002_index/index_base.t .... IndexRecord called with biblio 2
Indexing biblio 2
t/searchengine/002_index/index_base.t .... ok
t/searchengine/003_query/buildquery.t .... ok
t/searchengine/004_config/load_config.t .. ok
All tests successful.
Files=5, Tests=21,  4 wallclock secs ( 0.03 usr  0.01 sys +  2.74 cusr
0.20 csys =  2.98 CPU)
Result: PASS

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Had to get Solr going again to test this, man .. they could make that
easier

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>