OAK-1964: Performance degradation due to SessionDelegate.WarningLock
Only log the stack trace if debug level logging is enabled for SessionDelegate

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1609488 13f79535-47bb-0310-9956-ffa450edef68
OAK-1929: MicroKernelServer not usable with user specified MicroKernel implementation
Integrate the functionality of the MicroKernelServer with oak-run

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1609491 13f79535-47bb-0310-9956-ffa450edef68