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Refs: 3632

Refs: #3632

Refs: #3660

Refs: #3632

user_info --> user_get
Each kamaki session has a session user
The user defined in the config file through cloud....token
During the session, kamaki users may authenticate more users by tokens
and switch between them with user_set command
When authenticating a user, kamaki asks if you need to store this users
token as the session token

Refs: #3632

Refs: #3632

Refs: #3632

Refs: 3867

Refs: #3867

Refs: #3867

Commands affected: server_create/start/shutdown/reboot

Also, the wait functionality is now encapsulated in a _server_wait class
The server_wait command is just an implementation of this class.

    Modify print_list/dict/items methods of kamaki.cli.utils to be simpler
    and print output in a simpler form

    key: value
    key:
        key: value
        key:
            key: value
            ...
        key:
            list-item

            list-item
        key-for-list-of-dicts:
            key: value
            key: value

            key: value
            ...

New commands:

floatingip list/create/delete/info/pools
server ip attach/detach

Also, renamed the assoc/disassoc floating ip clients methods to
attach/detach_floating_ip

Refs: #3964