OAK-6498: Update Oak trunk to Jackrabbit 2.15.5
OAK-6498: Update Oak trunk to Jackrabbit 2.15.5

git-svn-id: 67138be12999c61558c3dd34328380c8e4523e73@1803985 13f79535-47bb-0310-9956-ffa450edef68

mduerig/jackrabbit-oak,mduerig/jackrabbit-oak,mduerig/jackrabbit-oak,mduerig/jackrabbit-oak,mduerig/jackrabbit-oak