HBASE-12270 A bug in the bucket cache, with cache blocks on write enabled (Liu Shaohui)
HBASE-12761 On region jump ClientScanners should get next row start key instead of a skip.

Signed-off-by: stack <stack@apache.org>

Conflicts:
	hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.java