Add CreatedAt filed to volume. Display when volume is inspected.

Closes #32663 by adding CreatedAt field when volume is created.
Displaying CreatedAt value when volume is inspected
Adding tests to verfiy the new field is correctly populated

Signed-off-by: Marianna <mtesselh@gmail.com>

Moving CreatedAt tests from the CLI

Moving the tests added for the newly added CreatedAt field for Volume, from CLI to API tests

Signed-off-by: Marianna <mtesselh@gmail.com>
Upstream-commit: a46f757c4043031379362c5d6b3bad7562ab9fed
Component: engine

components/engine/api/swagger.yaml

@@ -1047,6 +1047,10 @@ definitions:
         type: "string"
         description: "Mount path of the volume on the host."
         x-nullable: false
+      CreatedAt:
+        type: "string"
+        format: "dateTime"
+        description: "Time volume was created."
       Status:
         type: "object"
         description: |
@@ -1100,6 +1104,7 @@ definitions:
         com.example.some-label: "some-value"
         com.example.some-other-label: "some-other-value"
       Scope: "local"
+      CreatedAt: "2016-06-07T20:31:11.853781916Z"
 
   Network:
     type: "object"

components/engine/api/types/volume.go

@@ -7,6 +7,9 @@ package types
 // swagger:model Volume
 type Volume struct {
 
+	// Time volume was created.
+	CreatedAt string `json:"CreatedAt,omitempty"`
+
 	// Name of the volume driver used by the volume.
 	// Required: true
 	Driver string `json:"Driver"`