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Refs: #4058

Refs: #4058

Refs: #4058

Also, make argument package a directory

Refs: #4058

Refs: #4126

Refs: #4058

Refs: #4058

Refs: #4058

Only a __init__ and name methods are tested for now

Refs: #4115

Refs: #4115

New commands: astakos_commission_*:
    pending, info, action, accept, reject, resolve

Also implement the CommaSeparatedListArgument structure

Refs: #4115

New commands: astakores_resources/feedback/endpoints

Also, wrap astakosclient expositions with an error handling decorator

Refs: #4114

Refs: #4114

E.g. the cyclades spec package contains the non-optional group "server" and
the optional group "floatingip". Now kamaki can load only the "server"
group, except if the user requests the loading of "floatingip" group too.

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.