bin/solr check to see if solr.jetty.https.port should be set always returns true

This always returns true on Mac OS X (not sure about Linux):

  if [ "$SOLR_SSL_ENABLED" ]; then
    # If using SSL and solr.jetty.https.port not set explicitly, use the jetty.port
    SSL_PORT_PROP="-Dsolr.jetty.https.port=$SOLR_PORT"
    SOLR_OPTS+=($SOLR_SSL_OPTS "$SSL_PORT_PROP")
  fi

On master, we do if [ "$SOLR_SSL_ENABLED" == "true" ]; then

The problem is that ZkContainer (when zkRun enabled) looks to see if solr.jetty.https.port is set, and if so, then it assumes TLS is enabled. So this little BASH bug causes Solr's HttpShardHandler to connect via https.