Add setjava to builder script

Author: cindy-peng

.kokoro/build.sh

@@ -78,6 +78,7 @@ integration)
       -Dclirr.skip=true \
       -Denforcer.skip=true \
       -fae \
+      ${SUREFIRE_JVM_OPT} \
       verify
     RETURN_CODE=$?
     ;;

.kokoro/common.sh

@@ -59,6 +59,7 @@ function println() { printf '%s\n' "$(now) $*"; }
 function setJava() {
   export JAVA=$1/bin/java
   export JAVA_HOME=$1
+  export SUREFIRE_JVM_OPT=-Djvm=${JAVA_HOME}/bin/java
   export PATH=${JAVA_HOME}/bin:$PATH
 }