standardize name of 2.0-2.1 upgrade script

Signed-off-by: Galen Charlton <gmc@esilibrary.com>

diff --git a/Open-ILS/src/sql/Pg/2.0-2.1.sql b/Open-ILS/src/sql/Pg/2.0-2.1-upgrade-db.sql
similarity index 100%
rename from Open-ILS/src/sql/Pg/2.0-2.1.sql
rename to Open-ILS/src/sql/Pg/2.0-2.1-upgrade-db.sql