MODCLUSTER-435: Comparing balancer name is now case-insensitive

I have a test for this issue, addressing [BZ 1044879](https://bugzilla.redhat.com/show_bug.cgi?id=1044879)/[MODCLUSTER-435](https://issues.jboss.org/browse/MODCLUSTER-435). The test passes with this fix and related test cases on session stickiness and multiple balancer configurations didn't reveal any regression.