This patch updates the network modules to use the new
osc_lib.utils.tags module and removes the in tree _tag.py version.

A previous patch[1] moves the _tag.py code to osc-lib to allow other
projects to leverage the code.

[1] https://review.opendev.org/662859

Change-Id: Id0c34029e327de50c5fd2732bae5fbf45bbd16ee

1. As mentioned in [1], we should avoid using six.iteritems to achieve
   iterators. We can use dict.items instead, as it will return iterators
   in PY3 as well. And dict.items/keys will more readable.

2. In py2, the performance about list should be negligible,
   see the link [2].

[1] https://wiki.openstack.org/wiki/Python3
[2] http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html

Co-Authored-By: Akihiro Motoki <amotoki@gmail.com>
Change-Id: I4b9edb326444264c0f6c4ad281acaac356a07e85
Implements: blueprint replace-iteritems-with-items

If neutron does not support extraroute l3 extension, the route column
formatter fails.

Change-Id: I7b89c4f818865073947e0850e86c18d0d2415a51

$namespace = openstack.network.v2

The subcommand documents for $namespace were hardcoded and thus prone to
drift over time. This commit removes the hardcoded content and uses the
autoprogram-cliff directive to generate them automatically from the
subcommand configuration classes.

This one turned out to be quite involved, because we support both
neutron and nova-network. When running in a real cloud, the command
classes detect whether the neutron service is present, assume
nova-network if that service is not found, and only add parser options
relevant to the detected service. But the docs need to present both sets
of options. This was easy enough when they were hardcoded, but required
a bit of additional infrastructure for generated docs.

Change-Id: I426261eb1d86bcc68656aabd61f10b7f082da402

With the subnet_dns_publish_fixed_ip extension Neutron has added a new
attribute to subnets, allowing to select whether DNS records should be
published for fixed IPs from that subnet. Add support for this when
creating and updating subnets.

[0] https://bugs.launchpad.net/neutron/+bug/1784879
[1] https://review.opendev.org/662405
[2] https://review.opendev.org/662409

Depends-On: https://review.opendev.org/679833
Change-Id: Ia804e878acfd1f05e1f00c2ac9202c1d260827f4

These return a Munch from the SDK, which can be handled exactly
like a dict so do that.

Note that the location column has a nested project dict in the
return value, this is addressed separately in osc_lib.format_columns
in https://review.opendev.org/#/c/679474/.

Change-Id: I99a6d192749a4ac76777f72be8118261c0521cb0
Signed-off-by: Dean Troyer <dtroyer@gmail.com>

Add following commands:
  floating ip port forwarding create
  floating ip port forwarding delete
  floating ip port forwarding list
  floating ip port forwarding set
  floating ip port forwarding show

Closes-Bug: #1811352
Change-Id: I6a5642e8acce28fc830410d4fa3180597b862761