Add api-ref for container logs

This patch adds api-ref for container logs.

Closes-Bug: #1720924
Change-Id: I652a5a592ecfe0f06e8df594ba4074f285ab891c

api-ref/source/containers.inc

@@ -6,7 +6,7 @@
 
 Lists, creates, shows details for, stats, updates, deletes, starts, resize,
 stops, pauses, unpauses, restarts, renames, commits containers, and adds
-security group for specified container.
+security group for specified container, gets logs of a container.
 
 Create new container
 ====================
@@ -819,3 +819,49 @@ This request does not return anything in the response body.
 .. rest_parameters:: parameters.yaml
 
   - X-Openstack-Request-Id: request_id
+
+
+Get logs of a container
+=======================
+
+.. rest_method:: GET /v1/containers/{container_ident}/logs?timestamps={timestamps}&&since={since}&tail={tail}&stderr={stderr}&stdout={stdout}
+
+Get logs of a container.
+
+Response Codes
+--------------
+
+.. rest_status_code:: success status.yaml
+
+   - 200
+
+.. rest_status_code:: error status.yaml
+
+   - 400
+   - 401
+   - 403
+   - 404
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - container_ident: container_ident
+   - timestamps: timestamps
+   - tail: tail
+   - stderr: stderr
+   - stdout: stdout
+   - since: since
+
+Request Example
+----------------
+
+.. literalinclude:: samples/container-logs-req.json
+   :language: javascript
+
+Response
+--------
+
+This request returns logs string as a response, which is
+not in json format.

api-ref/source/parameters.yaml

@@ -53,18 +53,48 @@ security_group_query:
   in: query
   required: true
   type: string
+since:
+  description: |
+    Show logs since a given datetime or integer epoch (in seconds).
+  in: query
+  required: false
+  type: string
+stderr:
+  description: |
+    Get standard error if True.
+  in: query
+  required: false
+  type: boolean
+stdout:
+  description: |
+    Get standard output if True.
+  in: query
+  required: false
+  type: boolean
 tag:
   description: |
     The tag of the container image.
   in: query
   required: true
   type: string
+tail:
+  description: |
+    Number of lines to show from the end of the logs, default is get all logs.
+  in: query
+  required: false
+  type: string
 timeout:
   description: |
     Seconds to wait before operating on container.
   in: query
   required: true
   type: string
+timestamps:
+  description: |
+    Whether to show timestamps in the logs of container.
+  in: query
+  required: false
+  type: boolean
 width:
   description: |
     The tty width of a container.

api-ref/source/samples/container-logs-req.json

@@ -0,0 +1,7 @@
+{
+    "timestamps": "True",
+    "tail": "all",
+    "since": "600000",
+    "stderr": "True",
+    "stdout": "True"
+}