testsuite: add job-list database tests

Author: chu11

t/Makefile.am

@@ -140,6 +140,7 @@ TESTSCRIPTS = \
 	t2250-job-archive.t \
 	t2260-job-list.t \
 	t2261-job-list-update.t \
+	t2262-job-list-db.t \
 	t2270-job-dependencies.t \
 	t2271-job-dependency-after.t \
 	t2272-job-begin-time.t \