[BEAM-3060] Temporary fix for failing tests on dataflow runner.

[szewi]

Bug is described in https://issues.apache.org/jira/projects/BEAM/issues/BEAM-3268

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[szewi]

TextIO is failing on dataflow runner. Bug is described and currently investigated in separate dataflow related issue: https://issues.apache.org/jira/projects/BEAM/issues/BEAM-3268 here is a fix for our tests. cc @chamikaramj

[chamikaramj]

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