Add the hbase shell table_att for any attribute
-----------------------------------------------

                 Key: HBASE-5767
                 URL: https://issues.apache.org/jira/browse/HBASE-5767
             Project: HBase
          Issue Type: Improvement
          Components: shell
            Reporter: Xing Shi
            Priority: Minor


Now the HTableDescriptor supports setValue(String key, String value) method, 
but the hbase shell not support it.

May be like this:
{quota}
hbase(main):003:0> alter 'test', METHOD=>'table_att', 'key1'=>'value1'
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 1.0820 seconds

hbase(main):005:0> describe 'test'
DESCRIPTION                                                                     
          ENABLED                                          
 {NAME => 'test', key1 => 'value1', FAMILIES => [{NAME => 'f1', BLOOMFILTER => 
'NONE', RE true                                             
 PLICATION_SCOPE => '0', VERSIONS => '3', COMPRESSION => 'NONE', MIN_VERSIONS 
=> '0', TTL                                                  
  => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 
'true'}]}                                                     
1 row(s) in 0.0300 seconds

hbase(main):007:0> alter 'test', METHOD=>'table_att_unset', NAME=>'key1'
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 1.0860 seconds

hbase(main):008:0> describe 'test'
DESCRIPTION                                                                     
          ENABLED                                          
 {NAME => 'test', FAMILIES => [{NAME => 'f1', BLOOMFILTER => 'NONE', 
REPLICATION_SCOPE => false                                            
  '0', VERSIONS => '3', COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL => 
'2147483647',                                                   
 BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}]}            
                                                           
1 row(s) in 0.0280 seconds
{quota}

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