Review Request: Fixed a bug where a filter specified via --gtest_filter (or GTEST_FILTER) was not properly included in the filter we construct based on the environment.

[Benjamin Hindman]

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https://reviews.apache.org/r/9973/
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Review request for mesos and Vinod Kone.


Description
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See summary.


Diffs
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  src/tests/environment.cpp 32282d4c6c11791bfadd42c9b43b8da02d0bde28 

Diff: https://reviews.apache.org/r/9973/diff/


Testing
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make check


Thanks,

Benjamin Hindman