Do not add nv recordtype kv twice

put.add will happily record the same KV multiple times. This can be annoying/confusing on the hbase side (e.g. in coprocessors).
Adjust permission format

Adjust permission format in DEFAULT_PERSSIONS to the new syntax expected by hbase-authz.
change security label things

Security labels are now a single string, and are now stored in a column familiy + qualifier selected by the application on a per table basis, the name of the CF&Q is stored in the table descriptor.
The setSecurityLabel method had become absurdly trivial, so removed it.