Add subcommand parsing capability

Registered by Sharat Sharma on 2016-11-07

Mistral client is currently unable to parse the sub-commands.
For Example:
==========
if the user asks for help on a particular use case, say, workflow-create,

$ mistral workflow-create --help

Actual Output:
All the mistral usecases are being displayed

Expected Output:
Only the help message for workflow-create usecase must be displayed.

To summarize,
"mistral COMMAND --help" must be the same as "mistral help COMMAND" as this is the behavior in all the other projects.

Blueprint information

Status:
Complete
Approver:
Renat Akhmerov
Priority:
Medium
Drafter:
Sharat Sharma
Direction:
Approved
Assignee:
Sharat Sharma
Definition:
Obsolete
Series goal:
None
Implementation:
Deferred
Milestone target:
milestone icon 2.2.0
Completed by
Sharat Sharma on 2017-04-19

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