rename fip operation to attach/detach

[carmark]

[lei@h8s-single hypercli]$ pkt fip attach --help

Usage:  hyper fip attach [OPTIONS] FIP CONTAINER

Connects a container to a floating IP

  --help             Print usage
[lei@h8s-single hypercli]$ pkt fip detach --help

Usage:  hyper fip detach [OPTIONS] CONTAINER

Disconnects container from a floating IP

  --help             Print usage

[lei@h8s-single hypercli]$ pkt fip --help

Usage:  hyper fip [OPTIONS] COMMAND [OPTIONS]

Commands:
  allocate                 Allocate a or some IPs
  attach                   Attach floating IP to container
  detach                   Detach floating IP from conainer
  ls                       List all floating IPs
  release                  Release a floating IP

Run 'hyper fip COMMAND --help' for more information on a command.

  --help             Print usage