Add functional tests to fuxi gate

Registered by hongbin

Kuryr-libnetwork has a rally test coverage: https://review.openstack.org/#/c/255219/ . Fuxi needs something similar.

Blueprint information

Status:
Not started
Approver:
ZhangNi
Priority:
Undefined
Drafter:
hongbin
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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