ripe-import: Add DB update script for route_automatic

This adds an update script for the new route_automatic table. The name
script file does not include a version number like the other update
scripts because it's not clear yet which version this file will be
included in.

Related to #15

sql/update-route.sql

@@ -0,0 +1,18 @@
+-- Update script for the route_automatic table.
+
+CREATE TABLE route_automatic (
+    route_automatic_id SERIAL PRIMARY KEY,
+    address CIDR NOT NULL,
+    asn BIGINT NOT NULL,
+    import_source VARCHAR(500) NOT NULL,
+    import_time TIMESTAMP NOT NULL,
+
+    -- explicitly name the constraint to make sure it has the same name
+    -- as the constraint created by initdb.sql.
+    CONSTRAINT automatic_templ_import_source_check CHECK (import_source <> ''),
+
+    UNIQUE (address, asn, import_source)
+);
+
+CREATE INDEX route_automatic_cidr_gist_idx ON route_automatic
+       USING gist (address inet_ops);