Fix memcheck and dr memory after flakiness dashboard deployment.
Fix memcheck and dr memory after flakiness dashboard deployment.

I deployed buildbot configuration for uploading data to the
flakiness dashboard but I didn't predict our Dr Memory and
Memcheck bots would fail due to the new flag passed to the test.
Adding the --gtest_output flag to the script will avoid the build
to fail as a workaround.

TBR=andrew@webrtc.org
TESTED=Passing test run using:
src/tools/valgrind-webrtc/webrtc_tests.sh --test audio_decoder_unittests --tool memcheck --target Release --build-dir src/out --gtest_output=xml:audio_decoder_unittests.xml

BUG=

Review URL: https://webrtc-codereview.appspot.com/28999004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@7642 4adac7df-926f-26a2-2b94-8c16560cd09d

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