OAK-150: Basic JCR LockManager support

Simplify cleanup of session-scoped locks
Further trimming of the known issue list

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1518066 13f79535-47bb-0310-9956-ffa450edef68
OAK-150: Basic JCR LockManager support

Update NodeImpl locking methods to match the equivalent code in LockManagerImpl
Fix one failing test case, trim others.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1518067 13f79535-47bb-0310-9956-ffa450edef68