HBASE-9001 Add a toString in HTable, fix a log in AssignmentManager

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1539425 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9885 Avoid some Result creation in protobuf conversions

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1539429 13f79535-47bb-0310-9956-ffa450edef68