Use '-' in all CLI option names

Registered by Dean Troyer

Update the quantum cli client by changing all options to use '-' (dash) in long names rather than '_' (underscore). The previous underscore option names will be maintained for backward compatibility for a release or two but not show up in help output or documentation, or be clearly marked 'DEPRECATED' if they do appear.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Dean Troyer
Direction:
Needs approval
Assignee:
Dean Troyer
Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
yong sheng gong
Completed by
yong sheng gong

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

Addressed by: https://review.openstack.org/11888
    Change '_' to '-' in options

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