rabbitmq: Configure dch-webhooks/host-provisioner

The *dch-webhooks* user is used by *dch-webhooks* in order to publish
host information when a new machine triggers its _POST /host/online_
webhook.  It therefore needs to be able to write to the
_host-provisioner_ queue (via the default exchange).

The *host-provisioner* user is used by the corresponding consumer to
receive the host information and initiate the provisioning process.

rabbitmq/definitions.json

@@ -12,6 +12,14 @@
         {
             "name": "xactmon",
             "tags": []
+        },
+        {
+            "name": "host-provisioner",
+            "tags": []
+        },
+        {
+            "name": "dch-webhooks",
+            "tags": []
         }
     ],
     "permissions": [
@@ -21,6 +29,20 @@
             "configure": "^xactmon\\..*",
             "read": "^xactmon\\..*",
             "write": "^xactmon\\..*"
+        },
+        {
+            "user": "dch-webhooks",
+            "vhost": "/",
+            "configure": "^host-provisioner$",
+            "read": "^host-provisioner$",
+            "write": "^(host-provisioner|amq\\.default)$"
+        },
+        {
+            "user": "host-provisioner",
+            "vhost": "/",
+            "configure": "^host-provisioner$",
+            "read": "^host-provisioner$",
+            "write": "^(host-provisioner|amq\\.default)$"
         }
     ]
 }