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Refs: #3978

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Refs: #3979

Refs: #3934 #3979

Refs: #3934

This commit server as a backup mostly, since the adjustments are not yet
applied to docs/commands and all docs/developers kamaki guides.

this commit serves back-up purposes mostly

Refs: #3964

Refs: #3964

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Refs: #3956

Refs:#3934

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