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Until now, a server's public NetworkInterface was not created in the DB
until the arrival of the message from Ganeti hooks. However, the IPv4
address of the NIC is reserved before sending the OP_INSTANCE_CREATE
job to Ganeti.

This drawback of this approach is that if the Ganeti hooks never run
(building ERROR), Cyclades will never associate the IPv4 address with
a machine and therefore this address will never be released.

This commit fixes this issue by creating the VM's public NIC in DB when
creating the server. Also the NetworkInterface model is extended with
a 'state' field to indicate if the NIC is active or still building.
Finally, the corresponding API calls are modified in order to return
only 'ACTIVE' NICs.

Move UserCache from synnefo.management.common to synnefo.lib.astakos.
Also, update ListCommand with 'astakos_url' and 'astakos_token' class
attributes, which must be declared only when 'user_uuid_field' is used.

Make management commands relevant with servers and networks to accept
as arguments their Ganeti names, besides their database ID.

For example if BACKEND_PREFIX_ID='snf-', they following two commands are
both valid:

* snf-manage server-show 2
* snf-manage server-show snf-2

Create a generic ListCommand to be user for all *-list management
commands. ListCommand handles must tasks that are common to all
management commands, like retrieving objects from db, filtering
results and formating output to a pretty table, json or csv.

Also, implement server-list, network-list, backend-list and flavor-list
as subclasses of this command.

Move cyclades functions that are useful for all managament commands, like
pprint_table or parse_filters, to snf-webproject.

* Move retry decorator to utils module.
* Rename exceptions to be more intuitive.
* Add 403 Forbidden exception.
* Move exceptions to errors class

Refs: #3419

* AstakosClientEInvalid:
    Invalid X-Auth-Token, 401
* AstakosClientEMethod:
    Method not allowed, 400
* AstakosClientENotFound:
    Not Found, 404

Log retries.
Log hashed tokens.

Remove token argument from class initialization
method and make it a mandatory argument to all
the other class methods.

Never, ever log tokens

The first unit test for _callAstakos function, checks
the answer when there is no internet connection
(should raise a socket exception).

When unit testing our astakos-client module we have to
replace it's _doRequest function with some dummy ones.
In this commit we create this dummy functions that are
going to be used through our tests.