python: fix non-DECIMAL unit test breakage
python: fix non-DECIMAL unit test breakage

For reference, the table schema is:

  builder.add_column('key').type(kudu.int64).nullable(False)
  builder.add_column('unixtime_micros_val', type_=kudu.unixtime_micros, nullable=False)
  if kudu.CLIENT_SUPPORTS_DECIMAL:
    builder.add_column('decimal_val', type_=kudu.decimal, precision=5, scale=2)
  builder.add_column('string_val', type_=kudu.string, compression=kudu.COMPRESSION_LZ4, encoding='prefix')
  builder.add_column('bool_val', type_=kudu.bool)
  builder.add_column('double_val', type_=kudu.double)
  builder.add_column('int8_val', type_=kudu.int8)
  builder.add_column('binary_val', type_='binary', compression=kudu.COMPRESSION_SNAPPY, encoding='prefix')
  builder.add_column('float_val', type_=kudu.float)
  builder.set_primary_keys(['key', 'unixtime_micros_val'])

Change-Id: Ife6cc90ebf229f876854da6cb3a8857c192a296f
Reviewed-on: http://gerrit.cloudera.org:8080/11148
Reviewed-by: Andrew Wong <b68e4fdc6430321a6b47400732ff97d7ae91234e@cloudera.com>
Reviewed-by: Grant Henke <4cf7ebbe638391c4d27a10cf751b99bdbd1a1880@apache.org>
Tested-by: Kudu Jenkins

helifu/kudu,helifu/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu