LP#1279998 marc_stream_importer support alternate match strategies

LP#1279998 marc_stream_importer support alternate match strategies

Adds support for sending auto-overlay-1match and auto-overlay-best-match
in addition to auto-overlay-exact to Vandelay when performing the
import.  If no strategy is chosen, the script still defaults to
auto-overlay-exact.

These changes are managed with 3 new command line options:

--auto-overlay-exact
--auto-overlay-1match
--auto-overlay-best-match

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>