[master] merge trac1153: zonemgr exits on empty zones

ChangeLog

+284.	[bug]		jerry
+	b10-zonemgr: zonemgr will not terminate on empty zones, it will
+	log a warning and try to do zone transfer for them.
+	(Trac #1153, git TBD)
+
 283.    [bug]		zhanglikun
 	Make stats and boss processes wait for answer messages from each
 	other in block mode to avoid orphan answer messages, add an internal