Allow options specified behind position arguments

Registered by yong sheng gong

Now, knows options must be put before last positional argument. We need to allow user to put them freely.
We also allow user to use - in unkown option part just like we do in known option parts. We also need to merge the options in known and unknown parts

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
yong sheng gong
Definition:
New
Series goal:
Accepted for 2.0
Implementation:
Implemented
Milestone target:
milestone icon 2.2
Started by
yong sheng gong
Completed by
yong sheng gong

Related branches

Sprints

Whiteboard

we will allow user to use:
quantum subnet-update --no-gateway subnet1
or
quantum subnet-update subnet1 --no-gateway

Gerrit topic: https://review.openstack.org/#q,topic:bp/options-location,n,z

Addressed by: https://review.openstack.org/17862
    Allow known options defined after position arguments.

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Work Items

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