Fix the travis issue
Fix the travis issue

For example [1]:

    FAILURE: Build failed with an exception.
    * Where:
    Script '/thrift/src/thrift-0.17.0/lib/java/gradle/generateTestThrift.gradle' line: 40
    * What went wrong:
    A problem occurred evaluating script.
    > assert thriftFile.exists()
             |          |
             |          false
             /thrift/src/thrift-0.17.0/test/partial/thrift_test_schema.thrift

[1]: https://app.travis-ci.com/github/apache/thrift/jobs/557030315

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