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Also, adjust to new "kamaki.cli" naming conventions

The Cyclades client overrides some methods of the OS-specific
client, due to API differences: create_volume, create_snapshot

Unit tests for these methods are also implemented

Includes unit tests

Package name: kamaki.clients.blockstorage

Fixes #25

If the default log file location is not accessile, inform user
about the error (e.g., no write permission, location does not
exist). Also, make non-debug log messages shorter and make sure
all instructions and warnings are printed to standard error.

Fixes #21

Refs #21

Refs #21

Refs #21

Fixes #22

Closes #27

Fixes #24

This bug caused AstakosClientError class to call both parent
class constructors, while only the AstakosClientException class
constructor needs to be called.

The false alarm in caused when testing kamaki threads that run too
fast to catch them in an unfinished state. The "assert thread as
unfinished" check fails in that case, although nothing is wrong
with the functionality.

Refs #18

Most errors are caused by changes in the names of classes,
methods and packages.

Old unitests were testing the old AstakosClient class, which
is not been used anymore. The new package inctroduces wrapper
classes for the synnefo.AstakosClient class. The later is not
tested in this patch, but the wrapper classes and kamaki-specific
extentions are.

Rename packages, classes, methods and variables
so that they comply with PEP8 standards.

Resolves #9

This variable was used only once per case

The object was a property, although this served no purpose at all.

Refs #9

This change affects both the kamaki.cli and kamaki.clients hierarchies
It is of semantic significance only
Backwards compatibility is preserved in kamaki.clients, so that
old code using base_url instead of endpoint_url will still work.

The method was used only once, so it is merged in caller code

Refs #9

Renamed to comply with pep8:
kamaki.cli.config.Config: _cloud_name --> cloud_name
kamaki.cli.shell: _init_shell --> init_shell

Merged with caller methods because they where used only once:
kamaki.cli: _construct_command_syntax, _num_of_matching_terms
kamaki.cli.utils: _parse_with_regex
kamaki.cli.one_cmd: _get_cmd_tree_from_spec, _get_best_match_from_cmd_tree

Remove now unused method _num_of_matching_terms

Refs #9

Renamed:
kamaki.cli.cmds._optional_json: _print --> print_
kamaki.cli.cmds.cyclades.Wait: _wait --> wait
kamaki.cli.cmds.cyclades.ServerWait: _wait --> wait
kamaki.cli.cmds.image: _load_image_meta --> load_image_meta
kamak.cli.cmds.network: _wait --> wait
kamaki.cli.cmds.pithos.PithosAccount:
    _is_dir --> obj_is_dir
    _resolve_pithos_url --> resolve_pithos_url

Removed:
kamaki.cli.cmds.pithos.PithosAccount:
    _validate_image_meta, _validate_image_location

DontRaire[KeyErrors/UnicodeErrors/etc] --> dont_raise(error type)
addLogSettings --> client_log
dataModification -->  fall_back

The following variables are now used only inside the module or
method they are defined: _help, _debug, _verbose, _color, filelog