add more properties to limits api

Registered by Eli Qiao

adding follows properties to limits and used_limits api.

* fixed_ips
* injected_file_path_bytes
* metadata_items
* injected_file_content_bytes
* server_group_members
* security_group_rules
* key_pairs
* injected_files

Blueprint information

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

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Work Items

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