CAY-1796 ROP: All entity's to-many relationships getting faulted from database when using it as a parameter in qualifier expression

fixing unit tests for DBs other than H2 - per Oleg Artyukevich

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1563386 13f79535-47bb-0310-9956-ffa450edef68