Need implement additional improvements for CLI of custom graphs

[TatyanaGladysheva]

Initial bug: https://bugs.launchpad.net/fuel/+bug/1563851

Additional improvements were separated from #1563851 (comments #22, #23, #24, #32):

1) config_id is meaningless and does not provide any useful info - it should be removed from the output
(comment #18 point 3) about config_id)

2) "graph upload and download commands have different semantics - upload allows to upload graphs of any type, but download does not allow to download release and plugin specific graphs without specifying environment id, which is a redundant restriction, moreover, to download cluster specific graph you need to explicitly set (--cluster), otherwise it will download full graph"

- It will be betted to fix spec describing how we are see the interface

5) A task that is uploaded has version 1.0.0 which is incorrect and does not inject a task into graph.
6) When graph is downloaded, it contains redundant field "task_name"
7) It is impossible to download plugin-specific graphs for particular plugin id