use keystoneauth instead of keystoneclient

Registered by Jeremy Liu

keystoneauth was extracted from keystoneclient, so it's better we replace usage of keystoneclient in favor of keystoneauth.

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Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Jeremy Liu
Direction:
Needs approval
Assignee:
Jeremy Liu
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Jeremy Liu
Completed by
Jeremy Liu

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