storm-env.sh unconditionally sets JAVA_HOME

STORM-1706 introduced storm-env.sh to the binary distribution. Before 1.0.1 we weren’t including `storm-env.sh`. That file does the following:

export JAVA_HOME=${JAVA_HOME}

Which, if JAVA_HOME is not set, will set it, but leave it empty. So the clojure code in supervisor.clj `if (nil? java-home)` will evaluate to false and we’ll end up with `/bin/java` as the java command.