Configuration and DDS example/tools updates

- Update DDS example command UI and extract it from example.
 - Unify address handling via DDS properties for dynamic deployment.
 - Update DDS docs with the new approach.
 - Allow `--config-key` to be used to access common config in JSON.
 - Allow common channel properties to be specified for all sockets.
 - Update MQ examples and Tuto3 with new config options.
 - Add start scripts to MQ examples for easier use.

examples/MQ/5-req-rep/ex5-req-rep.json

@@ -1,8 +1,8 @@
 {
     "fairMQOptions":
     {
-        "device":
-        {
+        "devices":
+        [{
             "id": "client",
             "channel":
             {
@@ -18,8 +18,6 @@
                 }
             }
         },
-
-        "device":
         {
             "id": "server",
             "channel":
@@ -35,7 +33,7 @@
                     "rateLogging": "0"
                 }
             }
-        }
+        }]
     }
 }