convert rbac*.sql files, except test-file, to Liquibase changesets

sql/28-hs-tests.sql

@@ -1,6 +1,15 @@
 ABORT;
 SET SESSION SESSION AUTHORIZATION DEFAULT;
 
+-- there are some random ractors in test data generation, thus a range has to be accepted
+CREATE OR REPLACE PROCEDURE expectBetween(actualCount integer, expectedFrom integer, expectedTo integer)
+    LANGUAGE plpgsql AS $$
+BEGIN
+    IF NOT actualCount BETWEEN expectedFrom AND expectedTo THEN
+        RAISE EXCEPTION 'count expected to be between % and %, but got %', expectedFrom, expectedTo, actualCount;
+END IF;
+END; $$;
+
 DO LANGUAGE plpgsql $$
 DECLARE
     resultCount integer;