TestImpalaShell.test_config_file failing on CentOS6/Python 2.6

shell.test_shell_commandline.TestImpalaShell.test_config_file[table_format_and_file_extension: ('parquet', '.parq') | protocol: beeswax] (from pytest)
Failing for the past 2 builds (Since Failed#204 )
Took 14 sec.
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Error Message

shell/test_shell_commandline.py:593: in test_config_file     assert err_msg in result.stderr E   assert 'Ignoring unrecognized config option' in "Loading in options from config file: /data/jenkins/workspace/impala-cdh6.x-exhaustive-centos6-shard2/repos/Impala/tes.../impalarc_with_error2 \n\nUnexpected value in configuration file. 'maybe' is not a valid value for a boolean option.\n" E    +  where "Loading in options from config file: /data/jenkins/workspace/impala-cdh6.x-exhaustive-centos6-shard2/repos/Impala/tes.../impalarc_with_error2 \n\nUnexpected value in configuration file. 'maybe' is not a valid value for a boolean option.\n" = <tests.shell.util.ImpalaShellResult object at 0xc41de90>.stderr

Stacktrace

shell/test_shell_commandline.py:593: in test_config_file
    assert err_msg in result.stderr
E   assert 'Ignoring unrecognized config option' in "Loading in options from config file: /data/jenkins/workspace/impala-cdh6.x-exhaustive-centos6-shard2/repos/Impala/tes.../impalarc_with_error2 \n\nUnexpected value in configuration file. 'maybe' is not a valid value for a boolean option.\n"
E    +  where "Loading in options from config file: /data/jenkins/workspace/impala-cdh6.x-exhaustive-centos6-shard2/repos/Impala/tes.../impalarc_with_error2 \n\nUnexpected value in configuration file. 'maybe' is not a valid value for a boolean option.\n" = <tests.shell.util.ImpalaShellResult object at 0xc41de90>.stderr