feature/493_remove_user_agent_check

[frbattid]

• Implements issue Avoid controlling the user agent in the notifications #493
• 100% unit tests passed:

Results :
Tests run: 51, Failures: 0, Errors: 0, Skipped: 0

• (unofficial) e2e tests passed:

$ cat resources/ngsi-examples/notification-json-simple.sh | grep User-Agent
curl $URL -v -s -S --header 'Content-Type: application/json' --header 'Accept: application/json' --header 'User-Agent: whatever/0.10.0' --header "Fiware-Service: $SERVICE" --header "Fiware-ServicePath: $SERVICE_PATH" -d @- <<EOF
[BEFORE THE FIX]
...
15/08/06 10:59:26 INFO handlers.OrionRestHandler: Starting transaction (1438851510-508-0000000000)
15/08/06 10:59:26 WARN handlers.OrionRestHandler: Bad HTTP notification (whatever/0.10.0 user agent not supported)
15/08/06 10:59:26 WARN http.HTTPSource: Received bad request from client. 
org.apache.flume.source.http.HTTPBadRequestException: whatever/0.10.0 user agent not supported
...
[AFTER THE FIX]
...
15/08/06 11:00:29 INFO handlers.OrionRestHandler: Starting transaction (1438851625-811-0000000000)
15/08/06 11:00:29 INFO handlers.OrionRestHandler: Received data ({  "subscriptionId" : "51c0ac9ed714fb3b37d7d5a8",  "originator" : "localhost",  "contextResponses" : [    {      "contextElement" : {        "attributes" : [          {            "name" : "temperature",            "type" : "centigrade",            "value" : "26.5"          }        ],        "type" : "Room",        "isPattern" : "false",        "id" : "Room1"      },      "statusCode" : {        "code" : "200",        "reasonPhrase" : "OK"      }    }  ]})
15/08/06 11:00:29 INFO handlers.OrionRestHandler: Event put in the channel (id=1809172135, ttl=10)
15/08/06 11:00:29 INFO sinks.OrionSink: Event got from the channel (id=1809172135, headers={fiware-servicepath=def_serv_path, destination=room1_room, content-type=application/json, fiware-service=def_serv, ttl=10, transactionId=1438851625-811-0000000000, timestamp=1438851629611}, bodyLength=460)
15/08/06 11:00:29 INFO sinks.OrionHDFSSink: [hdfs-sink] Persisting data at OrionHDFSSink. HDFS file (def_serv/def_serv_path/room1_room/room1_room.txt), Data ({"recvTime":"2015-08-06T09:00:29.611Z", "temperature":"26.5", "temperature_md":[]})
...

• Assignee @fgalan

[fgalan]

LGTM