Drop mysql-galera and zookeeper statefulset e2e-s

1. registry.k8s.io/galera-install:0.1 is not published anymore and
   probably has not been for quite a long. So the entire mysql-galera
   suite was removed.
2. docker.io/library/java:openjdk-8-jre was removed a while back
   (https://github.com/docker-library/openjdk/issues/505). Additionally,
   openjdk images are entirely deprecated
   (https://hub.docker.com/_/openjdk) and will likely be removed soon.
   The current zookeeper relies heavily on jre8, which is not available
   anymore so dropping the entire suite as well.

Signed-off-by: Maciej Szulik <soltysh@gmail.com>