bash-completion: devlink: Extend bash-completion for new commands

bash-completion: devlink: Extend bash-completion for new commands

Extend bash-completion for two new commands:

devlink trap policer set DEV policer POLICER [ rate RATE ] [ burst BURST ]
devlink trap policer show DEV policer POLICER

And for "policer" / "nopolicer" parameters in existing command:

devlink trap group set DEV group GROUP [ action { trap | drop } ]
                       [ policer POLICER ] [ nopolicer ]

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>