fix warning message when set USE_DRIP=1 and no JAVA_OPTS set in system #6034
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When launching logstash with option
USE_DRIP=1
likein function
setup_drip
, it would set$JAVA_OPTS
; then in follwing functionsetup_java
, it would output warning message that default $JAVA_OPTS would be overwritten. But actually user did not set "default $JAVA_OPTS".This fix would not output such warning message if user did not set $JAVA_OPTS