OAK-962: RootFuzzIT fails on MongoMK with seed -1091889749
@Ignored test case

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1514656 13f79535-47bb-0310-9956-ffa450edef68
OAK-961 Parametrise tests to run against all Microkernel backends
FIXMEs

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1514657 13f79535-47bb-0310-9956-ffa450edef68