[google|compute] Update Servers support

- Add missing "Server" properties
- Remove unnecessary property aliases
- When destroying a "Server" asyncronously return the "Operation" model instead of the raw operation response
- If zone is not set on "all" and "get" methods, use the list aggregated servers request (1 API call) instead of fetching all zones
- Add "list_aggregated_servers" request
- Fix "attach_disk" request
- Fix "detach_disk" request
- Add "get_server_serial_port_output" request
- Add "reset_server" request
- Add "set_server_disk_auto_delete" request
- Add "set_server_scheduling" request
- Fix "set_tags" request