HBASE-11491 Add an option to sleep randomly during the tests with the PE tool
HBASE-11492 The servers do not honor the tcpNoDelay option
Revert "HBASE-11492 The servers do not honor the tcpNoDelay option"

This reverts commit c80b4510443552d13f21f5eda62f94daff318565.
HBASE-11460 Deadlock in HMaster on masterAndZKLock in HConnectionManager
HBASE-11487 ScanResponse carries non-zero cellblock for CloseScanRequest (Shengzhe Yao)
HBASE-11488 cancelTasks in SubprocedurePool can hang during task error (Jerry He)
HBASE-11118 non environment variable solution for "IllegalAccessError: class com.google.protobuf.ZeroCopyLiteralByteString cannot access its superclass com.google.protobuf.LiteralByteString"
HBASE-11057 Improve TestShell coverage of grant and revoke comamnds (Srikanth Srungarapu)