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Refs: #3954

Refs: #3934

Refs: #3934

Refs: #3934

config set remote.smth.option value
  inserts option=value in remote smth
config get remote.smth
  lists the contents (key=val) of remote smth
config delete remote.smth.option
  deletes this specific option from the remote smth
config delete remote.smth
  completely erased the remote smth

Refs: #3934

Refs: #3934

In Config:

Simplify guess_version heuristics (check if the following exist:
    global.url/token, remote-defaults)
Trasnlate files 'remote "name"' to 3-level dict and back
Implement rescue_old_file to convert config files to v3.0

In kamaki.cli:

Implement method _check_config_version

Refs: #3934

rescue_old_file: mines info from old config file to use them in new file
translates:
  remote "smth" --> 'remote': {'smth': ...
  global.{url, token} --> remote.default.{url, token}
  <command>.cli --> global.command_cli
  some commands are maped to other names, e.g. pithos --> file
  <command>.url --> remote.defailt.<command>_url

Refs: #3934

Breaks compatibility, implements a remotes-based config file

Compatible with kamaki config files v2

user.url, file.url, compute.url and image.url
are now valid and of higher priority to
astakos.url, pithos.url, cyclades.url, plankton.url
which are also valid

All these are ignored iff [global].auth_url is given

Also, fix typos and default values for service configurations

Refs: #3874

Let cross-service initializations to use explicit service endpoint urls if
there is no single authentication url.
- In Image commands, there are calls that use astakos and pithos clients
- In pithos there are calls that use astakos client

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

Minimum config file:
[global]
token = <user token>

Changes:

- Only one field "cli" for user command specs, to map command groups to CLIs:

[cli]
 user = astakos
 file = pithos
 server = cyclades
...

- Specify client services/apis and versions.
 General format:
 [client]
  type = <service>
  version = <api version>

 Example:
 [cyclades]
  type = compute
  version = v2.0

Conflicts:
	Changelog
	version

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

Methods exposed:

get_user_info as authenticate
get_uuid[s] as uuid
get_username[s] as username
get_quotas as quotas
services_get_uuid[s]/username[s]/quotas as service uuid/username/quotas