Support metadata for access rule

Registered by zhongjun

The metadata here for access rule is the descriptive metadata. It's used for
discovery and identification. Users could add key-value pairs for the access rules
to describe them. And users can also filter access rules with specified metadata.

Blueprint information

Status:
Complete
Approver:
zhongjun
Priority:
Undefined
Drafter:
zhongjun
Direction:
Needs approval
Assignee:
zhongjun
Definition:
Approved
Series goal:
Proposed for rocky
Implementation:
Implemented
Milestone target:
milestone icon rocky-3
Started by
zhongjun
Completed by
zhongjun

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Sprints

Whiteboard

Addressed by: https://review.openstack.org/571366
    Support metadata for access rule resource in CLI

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Work Items

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