Multiple small changes:
@commiters: Removing some sleeps made visible a bug on JVMClusterUtil#HMaster#waitForServerOnline, so I had to add a synchro point. You may want to review this.
JVMClusterUtil#HMaster#waitForServerOnline: removed, the condition was never met (test on "!c && !!c"). Added a new synchronization point.
AssignementManager#waitForAssignment: add a timeout on the wait => not stuck if the notification is received before the wait.
HMaster#loop: use a notification instead of a 1s sleep
HRegionServer#waitForServerOnline: new method used by JVMClusterUtil#waitForServerOnline() to replace a 1s sleep by a notification
HRegionServer#getMaster() 1s sleeps replaced by one 0,1s sleep and one 0,2s sleep
HRegionServer#stop: use a notification on sleeper to lower shutdown by 0,5s
ZooKeeperNodeTracker#start: replace a recursive call by a loop
ZooKeeperNodeTracker#blockUntilAvailable: add a timeout on the wait => not stuck if the notification is received before the wait.
HBaseTestingUtility#expireSession: use a timeout of 1s instead of 5s
TestZooKeeper#testClientSessionExpired: use a timeout of 1s instead of 5s, with the change on HBaseTestingUtility we are 60s faster
TestRegionRebalancing#waitForAllRegionsAssigned: use a sleep of 0,2s instead of 1s
TestRestartCluster#testClusterRestart: send all the table creation together, then check creation, should be faster
TestHLog: shutdown the whole cluster instead of DFS only (more standard)
JVMClusterUtil#startup: lower the sleep from 1s to 0,1s
HConnectionManager#close: Zookeeper name in debug message from HConnectionManager after connection close was always null because it was set to null in the delete.