Tip of branch 0.98 has some binary incompatibilities with 0.98.0

In working on HBASE-12808, I ran a scan between the 0.98.0 tag and the tip of branch 0.98 and found a handful of binary incompatibilities that are probably worth addressing:

• org.apache.hadoop.hbase.security.access.AccessControlClient.grant and org.apache.hadoop.hbase.security.access.AccessControlClient.revoke had their return types and parameter lists changed in HBASE-12161. cc: srikanth235 and mbertozzi.
• org.apache.hadoop.hbase.mapreduce.CopyTable.createSubmittableJob is no longer static and its parameter list changed in HBASE-11997. cc: daviddengcn and tedyu.
• getBlockSize was added to the org.apache.hadoop.hbase.io.crypto.Encryptor interface in HBASE-11446, which may lead to an AbstractMethodError exception in a 0.98.0 client that doesn't have this implemented. I suspect this one is worth living with? cc: apurtell.