tests/semaphore.test.bash: match "DATA RACE"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

tests/semaphore.test.bash

@@ -22,4 +22,4 @@ docker run \
   gcr.io/etcd-development/etcd-test:go1.10.3 \
   /bin/bash -c "${TEST_OPTS} ./test 2>&1 | tee test-${TEST_SUFFIX}.log"
 
-! egrep "(--- FAIL:|panic: test timed out|appears to have leaked)" -B50 -A10 test-${TEST_SUFFIX}.log
+! egrep "(--- FAIL:|DATA RACE|panic: test timed out|appears to have leaked)" -B50 -A10 test-${TEST_SUFFIX}.log