Fix an incompatibility with hamcrest 2.2

[cushon]

This test asserts on the message of an AssertionError thrown by a
failing hamcrest assertion. The message changes in the latest versions
of hamcrest.

1) testBadCoderIsNotDeterministic(org.apache.beam.sdk.testing.CoderPropertiesTest)
java.lang.AssertionError:
Expected: a string containing "<84>, <101>, <115>, <116>, <68>"
     but: was "
Expected: [<24b>, <84b>, <101b>, <115b>, <116b>, <68b>, <97b>, <116b>, <97b>, <51b>, <51b>, <50b>, <54b>, <49b>, <57b>, <57b>, <52b>, <57b>, <48b>, <57b>, <57b>, <55b>, <48b>, <53b>, <53b>]
     but: was [<24b>, <84b>, <101b>, <115b>, <116b>, <68b>, <97b>, <116b>, <97b>, <51b>, <51b>, <50b>, <54b>, <49b>, <57b>, <57b>, <52b>, <56b>, <50b>, <48b>, <52b>, <49b>, <54b>, <49b>, <53b>]"
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:6)
        at org.apache.beam.sdk.testing.CoderPropertiesTest.testBadCoderIsNotDeterministic(CoderPropertiesTest.java:123)

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