XD 143

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
Merge remote-tracking branch 'springsource/master' into xd-143