Merge "Specs for Event Federation"

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (c) 2017-2018 VMware, Inc.
+
+=================
+Event/Alert/Metrics Federation
+=================
+
+As a cloud mediation layer, Multicloud could be invoked by many projects, through this feature, Multicloud will provide
+VM status/events check and also can customize the type of event which user would like to receive. There are some
+kinds of VM status can be chosen: DELETE, PAUSE, POWER_OFF, REBUILD，SHUT_DOWN, SOFT_DELETE, etc.. In VMware VIO Plugin,
+once any change of VM status is detected of a given type, Multicloud will catch the event and throw it to DMaaP.
+Other projects can try this way of getting VM status messages in the future. Also, for other Multicloud plugin providers,
+due to some issues, there will be rest apis for them to grab the VM status messages.
+
+The APP-C won't be impacted since APP-C can still call the existing API which implemented in Amsterdam Release
+ and the API is an existing API
+
+Use Cases
+===================
+
+In VIO, one typical use case is to allow VIO users to fetch messages from DMaaP, this will provide a easier way for fetching status of
+VMs, it may drastically reduce the time of close loop, for other Multicloud plugin providers, Multicloud will provide a set of
+rest apis to get them
+
+
+Proposed change
+===================
+
+In VIO plugin:
+
+The proposed change will include two parts: * listener: to listen the events of the status change of VM, for others it
+will have rest apis to get the messages * publisher: to throw the event to DMaaP.The message we try to send is something like this:
+{
+    "state_description": "powering-off",
+    "availability_zone": "nova",
+    "terminated_at": "",
+    "ephemeral_gb": 0,
+    "instance_type_id": 5,
+    "deleted_at": "",
+    "reservation_id": "r-pvx3l6s2",
+    "memory_mb": 2048,
+    "display_name": "VM1",
+    "hostname": "vm1",
+    "state": "active",
+    "progress": "",
+    "launched_at": "2018-03-07T05:59:46.000000",
+    "metadata": {},
+    "node": "domain-c202.22bfc05c-da55-4ba6-ba93-08d9a067138e",
+    "ramdisk_id": "",
+    "access_ip_v6": null,
+    "disk_gb": 20,
+    "access_ip_v4": null,
+    "kernel_id": "",
+    "host": "compute01",
+    "user_id": "aa90efa5c84c4084b39094da952e0bd1",
+    "image_ref_url": "http://10.154.9.172:9292/images/207b9b7c-9450-4a95-852b-0d6d41f35d24",
+    "cell_name": "",
+    "root_gb": 20,
+    "tenant_id": "943ecb804cdf4103976b8a02cea12fdb",
+    "created_at": "2018-03-07 05:58:01+00:00",
+    "instance_id": "4f398943-7d39-4119-8058-74768d6dfa52",
+    "instance_type": "m1.small",
+    "vcpus": 1,
+    "image_meta": {
+        "is_copying": "1",
+        "container_format": "bare",
+        "min_ram": "0",
+        "vmware_disktype": "streamOptimized",
+        "disk_format": "vmdk",
+        "source_type": "url",
+        "image_url": "https://cloud-images.ubuntu.com/releases/14.04/release/ubuntu-14.04-server-cloudimg-amd64-disk1.img",
+        "vmware_adaptertype": "lsiLogic",
+        "min_disk": "20",
+        "base_image_ref": "207b9b7c-9450-4a95-852b-0d6d41f35d24"
+    },
+    "architecture": null,
+    "os_type": null,
+    "instance_flavor_id": "2"
+}
+
+The eventual work flow looks like as follows:
+
+              +------------------+
+              |                  |
+              |   Multicloud     |
+              |     Broker       |
+              |                  |
+              +---------+--------+
+                        |
+                        |
+                        V
+            +-----------------------+            +------------------+
+            | Multicloud VIO Plugin |----------->| Dmaap            |
+            |                       |   Event    |                  |
+            +--------|-----^--------+            +------------------+
+            Oslo     |     |
+          Listener   |     |
+                     V     |
+            +----------------------+
+            | VIO                  |
+            +----------------------+
+
+
+In Other Plugins:
+
+Since the security rules of VIMs and network connectivity issues, other multicloud plugins won't be suitable for the
+oslo notification listener, so we will provide rest apis for them, the specific implementation will be dicided by them
+
+Input of <vim_id>/check_vim_status will be
+
+::
+  {
+    "states": array  // the set of VIM status which user wants to get
+  }
+
+Output of check_vim_status will be
+
+::
+  {
+    "state_description": string  // VIM's state
+    "launched_at": string // time of state change
+  }
+
+The work flow looks like as follows:
+
+              +------------------+
+              |                  |
+              |     Multicloud   |
+              |       Broker     |
+              |                  |
+              +---------+--------+
+                        |
+                        |
+                        V
+            +-----------------------+
+            | Multicloud Plugins    |
+            |                       |
+            +--------|-----^--------+
+            polling  |     |
+        or other way |     |
+                     V     |
+            +----------------------+
+            | Openstack            |
+            +----------------------+