Remove nova-network apis which had been abandon

Registered by jinxing fang

In the file of 'nova/nova/network/rpcapi.py', some function had been removed in old release, but the apis still could be called and the code is still in master branch.It's better to remove it.
Removed funtion list:
get_vifs_by_instance()
get_vif_by_mac_address()
get_network()
get_all_networks()
get_floating_ips_by_fixed_address()
get_instance_uuids_by_ip_filter()
disassociate_network()
get_fixed_ip()
get_fixed_ip_by_address()
get_floating_ip_pools()
get_floating_ip_by_address()
get_floating_ips_by_project()
get_instance_id_by_floating_address()
allocate_floating_ip()
deallocate_floating_ip()
associate_floating_ip()
disassociate_floating_ip()
associate()

Blueprint information

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

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