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Refs: #4300

Refs: #4300

Authentication (a.k.a. POST /tokens) is performed only if needed, therefore a
syntax query will not request for authentication.

A new method is introduced in kamaki.cli: init_chached_authenticator. This
method authenticated the resolved URL and TOKEN(s).

Until now, this functionality was part of the _init_session method located at
kamaki.cli entry point. Now, this method call has been pushed down.

In case of an interactive shell, the method is called during the shell setup
In case of a one_command, the method is called right before a new executable
command is initialized. This also means that a non-executable command name
space will not cause the execution of init_cached_authenticator.

This error apears in pithos livetest account_get, when there are no sharer accounts

Refs: #4292

Refs: #4292

Refs: #4292

Refs: #4292

Refs: #4292

Refs: #4292

Also, add the methods write, writeln and error to print something to
<_commands>._out/_out/_err respectively.

__builtin__.print is replaced by self.writeln or self.error

Refs: #4292

Refs: #4279

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: #4279, 4288

Refs: #4288, #4279

Also, replace page_hold with pydoc.pager

Refs: #4276

Refs: #4276

Refs: #4058

Refs: #4058

Refs: #4058