adding an example dir to test the rabbitmq implementation

examples/bin/examples/rabbitmq/query.body

@@ -0,0 +1,19 @@
+{
+    "queryType": "groupBy",
+    "dataSource": "randSeq",
+    "granularity": "all",
+    "dimensions": [],
+    "aggregations":[
+    { "type": "count", "name": "rows"},
+    { "type": "doubleSum", "fieldName": "events", "name": "e"},
+    { "type": "doubleSum", "fieldName": "outColumn", "name": "randomNumberSum"}
+    ],
+    "postAggregations":[
+    {  "type":"arithmetic",
+       "name":"avg_random",
+       "fn":"/",
+       "fields":[ {"type":"fieldAccess","name":"randomNumberSum","fieldName":"randomNumberSum"},
+                  {"type":"fieldAccess","name":"rows","fieldName":"rows"} ]}
+    ],
+    "intervals":["2012-10-01T00:00/2020-01-01T00"]
+}

examples/bin/examples/rabbitmq/rabbitmq_realtime.spec

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+[{
+    "schema": {
+        "dataSource": "randseq",
+        "aggregators": [
+            {"type": "count", "name": "events"},
+            {"type": "doubleSum", "name": "outColumn", "fieldName": "inColumn"}
+        ],
+        "indexGranularity": "minute",
+        "shardSpec": {"type": "none"}
+    },
+
+    "config": {
+        "maxRowsInMemory": 50000,
+        "intermediatePersistPeriod": "PT1m"
+    },
+
+    "firehose" : { "type" : "rabbitmq",
+                   "consumerProps" : { "username": "test-dude",
+                                       "password": "test-word",
+                                       "virtualHost": "test-vhost",
+                                       "host": "localhost"
+                                     },
+                 "queue" : "druidtest",
+                 "exchange": "test-exchange",
+                 "routingKey": "#",
+                 "parser" : { "timestampSpec" : { "column" : "utcdt", "format" : "iso" },
+                              "data" : { "format" : "json" },
+                              "dimensionExclusions" : ["wp"] } },
+
+    "plumber": {
+        "type": "realtime",
+        "windowPeriod": "PT5m",
+        "segmentGranularity": "hour",
+        "basePersistDirectory": "/tmp/example/rand_realtime/basePersist"
+    }
+}]