OAK-1267: Failure in ObservationRefreshTest
Add additional assertions to determine whether waiting for events timed out

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1574039 13f79535-47bb-0310-9956-ffa450edef68
OAK-1472 ConcurrentAddReferenceTest#addReferences still fails
 - tweaked the test so the #tearDown doesn't break it

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1574040 13f79535-47bb-0310-9956-ffa450edef68
OAK-1267: Failure in ObservationRefreshTest
Temporarily increase timeout to preclude false negatives

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1574059 13f79535-47bb-0310-9956-ffa450edef68