Xd 143 config support for XD admin & container

Added config/dirt.properties
      Since this properties file is used by both container & admin, I have
      named it as "dirt.properties".
    Added StreamServer application context admin.xml
      This will start the stream server with the configured stream deployer
      (currently it is Redis stream deployer with redisConnectionFactory)
    Removed all the redis commandLine options
      This will make the redis properties only be configured from
      config/dirt.properties: redis.hostname & redis.port
    Notes:
      Currently, the dirt.properties file is loaded on each of the app context
      as I don't feel having it imported at redis.xml as dirt.properties will
      have some more generic properties.
      Also, I haven't added the config/dirt.properties associated with the
      classpath resource as this may make launching stream server/container
      from within eclipse/gradle expecting the classpath resource. Hence,
      the dirt.properties is always referred from ${xd.home}/config