Commits on May 26, 2017

1. Filebeat Redis prospector type …

   This PR adds a new prospector type which reads the slowlog from redis. This slowlog is not in a file but in memory in redis. Because of this filebeat connects to redis and reads out the slowlog. It is important to note that the slow log size is limited in redis that is why after fetching the events from the slowlog filebeat resets the slow log.
   
   Example event looks as following:
   
   ```
   {
     "@timestamp": "2017-05-16T06:27:17.000Z",
     "beat": {
       "hostname": "ruflin",
       "name": "ruflin",
       "read_timestamp": "2017-05-16T06:27:19.275Z",
       "version": "6.0.0-alpha2"
     },
     "message": "SET hello world",
     "redis": {
       "slowlog": {
         "args": [
           "world"
         ],
         "cmd": "SET",
         "duration": {
           "us": 11
         },
         "id": 38,
         "key": "hello"
       }
     }
   }
   ```
   
   All args are combined in the "message" field output for easy retrieval.

   

   ruflin committed May 26, 2017
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