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Some commands carry "--wait" options with their respective help
messages. Some of the messages were referring to the wrong commands
and this is now fixed.

Fixes grnet/kamaki#101

The "create_subnet" library method is modified to accept empty
iterables as gateway values.

The "kamaki subnet create" CLI command is enhanced with a new
argument "--no-gateway".

Fixes grnet/kamaki#78

Refs grnet/kamaki#46

Retain backwards compatibility by keeping the "wait_port" method.
Implement a new method "get_port_status" to retrieve current status.
Keep the "--status" argument in "port wait" command for backwards
compatibility.

Refs grnet/kamaki#46

Fixes grnet/kamaki#56

The bug is limited in "kamaki create network"

Fixes #21

Refs #21

Fixes #24

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 underscore is removed because it is a global variable used
outside of the modules it is declared.
The new name is a precise description of what this variable is
used for.

Names are changed for uniformity. Backwards compatibility is kept,
(old names are not dismissed)

Renames:
CycladesRestClient --> CycladesComputeRestClient
CycladesClient --> CycladesComputeClient

Users can still import and user CycladesRestClient and CycladesClient

Renames:
_init_network --> _NetworkInit
_port_wait --> _PortWait

Renames:
generic --> Generic
user --> Astakos
history --> History
cyclades --> Cyclades
image --> Image
pithos --> Pithos

Rational: each command specification can feature a class of error
handling methods, which can be shared with other specs, if the
later need to borrow the same behavior

Also, new names conform with pep8 suggestions for class names

Move and rename:
kamaki.cli.cmds.cyclades._service_wait --> kamaki.cli.cmds.Wait

The class is now accessible to all commands, therefore it is not
an internal class for cyclades module. The name of the class
changed to conform with pep8 suggestions for classes

Both classes are located in kamaki.cli.cmds

New class is called "OptionalOutput"
Old and new classes were/are located at kamaki.cli.cmds

Class is located at kamaki.cli.cmds

Refs: #2

Notable changes:
 in CLI, --project --> --project-id
 in clients, create_floating_ip overwrites OS/network method

Add optional argument --project in create subcommands;
add subcommand "reassign" for "server", "network" and "ip" commands.

Refs: #5104

Refs: #5031

Better handling of the way we print a string in network list

Better handling of the way we print a string in network list

From now on, --no-network produces a "networks=[]" part,
while the absense of network-related arguments makes produces a
request without "networks" attributes.

From now on, --no-network produces a "networks=[]" part,
while the absense of network-related arguments makes produces a
request without "networks" attributes.