Boost test --log_format arg does not accept lowercase

In my environment all the boost tests fail with following errors, maybe it's boost version.
Changing xml -> XML as error message suggests fixed the problem.

xml is not a valid enumeration value name for parameter log_format.

Parameter: log_format
Specifies log format.
Command line formats:
--log_format=<HRF|CLF|XML>
-f <HRF|CLF|XML>
Environment variable: BOOST_TEST_LOG_FORMAT

For detailed help on Boost.Test parameters use:
lt-TNonblockingServerTest --help
or
lt-TNonblockingServerTest --help=<parameter name>
FAIL: TNonblockingServerTest
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18 of 19 tests failed
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