try without parallel

Author: chingor13

.kokoro/build.sh

@@ -57,7 +57,7 @@ case ${JOB_TYPE} in
         -Danimal.sniffer.skip=true \
         -Dmaven.wagon.http.retryHandler.count=5 \
         --also-make \
-        -T 1C ${SUREFIRE_JVM_OPT}
+         ${SUREFIRE_JVM_OPT}
     RETURN_CODE=$?
 
     if [[ -n "${BUILD_SUBDIR}" ]]