This patch only provide network name and subnet setting for
"network create" command.

The other options, such as --project which depends on
identity v2 or v3, will make the unit tests too complicated.
So I prefer to implement them in other patches.

Change-Id: I9ec93f0af813c8fae4170c36e16bbe8f0f53cbb6
Partial-Bug: 1543672

ShowNetwork inherits from NetworkAndComputeCommand. So we should use
update_parser_common() in it, not overwrite parent's get_parser().

Change-Id: I21bb1407962344b9800fd31caee4b2582674fe24

"network show" command is not implemented in nova network.
This patch implements it.

Change-Id: I1fadd890fe36c4e3ac5c9ed389b20c5b2fff8aca
partial-Bug: 1543672

"network list" command is not implemented in nova network.
This patch implements it.

The Network object in novaclient is quite different from
the one in sdk. And the output of "network list" using
Nova network is also quite different from using Neutron.

It is like this:

# openstack network list
+--------------------------------------+---------+-------------+
| ID                                   | Name    | Subnet      |
+--------------------------------------+---------+-------------+
| 96a98ec4-31f6-45f6-99e6-9384569b3bb5 | private | 10.0.0.0/24 |
+--------------------------------------+---------+-------------+

--long and --external options have not been implemented because
the attrs in Network object in novaclient is too much different.

This patch also introduces a new FakeNetwork class in compute/v2/fake.py
to fake nova network.

Change-Id: Id1fdf81fb2fa8b39f2c76b7bae37ac4fecafd0f7
Depends-On: I1b59264cd40aaf1062f4e8db233ccb7fd0e95f0e
partial-Bug: 1543672

In other commands, the name or ID of an object is just the name
of the object. For example, name or ID of a server is "server",
router is "router". So, do not use "identifier" in network commands.

Also, the parameter in doc file network.rst is not "identifier",
but "network".

Change-Id: I1ec3beefbb878a207bca280b994ca176ef04ee2d

"network delete" command is not implemented in nova network.
This patch implements it.

Change-Id: I5dac1eed6eb8e67298bb446418835a6ab85c859c
Depends-On: I1b59264cd40aaf1062f4e8db233ccb7fd0e95f0e
partial-Bug: 1543672

get_body() is needed in each network files to construct a dict
to pass to sdk proxy. And it is also used by several functions
in each file. So define it as a file level private helper function.

The unified prototype should be:

    def _get_attrs(client_manager, parsed_args):

1. The name, in sdk, the parameter passed to proxy is named "attrs".
   And it is a private method. So let's call it _get_attrs().
2. The parameters, besides parsed_args, when we deal with project
   and project_domain, we have to make use of identity_client. So
   let's pass in the client manager.

Change-Id: Ib044ebd4ddedbcd805f46334a7fe99e4ebb5b249

Previously each command logs take_action parameters explicitly
by using @utils.log_method decorator or log.debug().
Some commands have no logging.

This commit calls a logger in the base class and
drops all logging definition from individual commands.

Closes-Bug: #1532294
Change-Id: I43cd0290a4353c68c075bade9571c940733da1be

Add --availability-zone-hint parm to network create. Also add
availability_zones and availability_zone_hints to the network list and network
show commands

Change-Id: Ib4dc2e3e7897939be7bef6b25a095c8222b885bc
Partially-implements: blueprint neutron-client