Bug 509: Fixed Backwards compatibility bugs with datastore.

Fixed bug in write and merge of leaf set children,
which prevented update of leaf sets.

Change-Id: I61c130b9d40876ae50468ebfbd2cf15208f1249c
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Bug 930 - Add bound to queue in SingletonHandler#NOTIFICATION_EXECUTOR .

Add queue capacity with hardcoded value 10. When maxPoolSize + queue capacity
is reached, caller thread will be blocked.
Mark thread as interrupted when catching InterruptedException, propagate it
to caller.
Remove code that pushed first two runnables to queue when core size was
reached - saturate whole threadpool capacity first.

Change-Id: I9c52b52eac127bea0cbb2abf7a65c0165daf8895
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Bug 509: Fixed DataTransactionListener support.

Change-Id: I4a9861ed543ce01e349737f7e779c2cfb5b1f107
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Merge changes I4a9861ed,I61c130b9

* changes:
  Bug 509: Fixed DataTransactionListener support.
  Bug 509: Fixed Backwards compatibility bugs with datastore.
Merge "Bug 930 - Add bound to queue in SingletonHandler#NOTIFICATION_EXECUTOR ."