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Returns the synnefo-astakosclient object

Refs: #4337, #4312

Refs: #4337

New methods: uuids2usernames, usernames2uuids
Keep post_user_catalogs for bw comp.

Refs:#4312

Refs: Bug #4276

New format:

/image register Name container:path/to/image

Old format:

/image register Name pithos://user-uuid/container/path/to/image

Now, the old format is also recognized. It is planed to be depricated in a
future version, though

Also, uniformize guides and doc responses for image register

Refs: #4228

Refs: #4203

Refs: #3660

Refs: #3632

Also, fix typos and default values for service configurations

Refs: #3874

In current configuration, kamaki checks for auth_url. If that fails,
it raises an error. If it is not set, it prints a warning and attempts
to read the <service>.url option from the configuration file.

Service urls: astakos.url, pithos.url, cyclades.url, plankton.url

Refs: #3913

Config file can (optionaly) contain:

[remotes]
 example = https://www.example.org/astakos/identity/v2.0/
 old_version = https://www.example.org/astakos/identity/v1.0/
 ...

Now, user can explicitely request for a remote cloud authentication URI:

kamaki --cloud=<remote>

Refs: #3874

Use kamaki.clients.astakos.AstakosClient as a cached astakos client to get
user information and, most importantly, endpoints. Allow users to authenticate
multiple tokens on the same session. In every session there must be at most
one authentication per user/token.

Major change: top kamaki.cli.commands class now contains a base_auth field
with the cached authenticating client. All urls are drained from this field.

Refs: #3874

Kamaki.clients.astakos.AstakosClient is now a high-level client lib that
offers access to token-authenticated astakos-aquired cached information.
Users who need an astakos client should use the snf-astakosclient instead.

Usage:

 astakos_cache = AstakosClient(<astakos/base/url/with/identity/api>)
 astakos_cache.authenticate(<token>)
 user_info = astakos_cache.user_info()
 compute_endpoints = astakos_cache.get_service_endpoints('compute', 'v2')

Major changes:

Modify ReST call from /im/authenticate to /tokens

New methods as AstakosClient instance cache accessors:
 get_services
 get_service_details
 get_service_endpoints

Method renaiming for existing AstakosClient instance cache accessors:
 info --> user_info
 user --> list_users

In some cases, the term 'GRNET development team' was replaced with 'Synnefo' or
'Synnefo development team'

list method returns a list of all cached user informations, one for each token

Most astakos services need admin auth to test

Two modes: astakos service and astakos admin
They both have a userinfo command

astakos imports an anused (and soon deprecated) module

Seperate Client to Client and HTTPConnection
The later is put in a separate package kamaki.client.connection
It manages headers, params, method, url and data of a connection
but the actuall http connection is not implemented at this
abstract level
There is an HTTPRequest class extention of HTTPConnection in the
same package. It implements connection using requests package
so basicaly it replicates the connection procedure that was used
in kamaki so far.
Minor modifications were nessacary at every client lib package

Setup is now aware of gevent and commands package