GMU: added a test case for a previous bugfix
GMU: added test case for consistency check when a node is a read-only participant in a transaction
 * Speculative commit with one more stat.
 * Verbosity still to be reduced
 * Fixing NPE in RpcManagerWrapper
 * Trying to fix lockHoldTimes
 * Trying to refactor something
 * Trying to have remoteHoldTime also in Isolation!=Serializable
 * Fixing remoteHoldTime