a)

/os-floating-ips was removed in Compute API 2.36 and from novaclient's
Python API in 10.0

Add to api.computev2:
floating_ip_add()
floating_ip_remove()

Convert add floating IP command to nova-net/neutron split:
"server add floating ip"
"server remove floating ip"

b)

/os-hosts was removed in Compute API 2.43 and from novaclient's
Python API in 10.0.

Add to api.computev2:
host_list()
host_set()
host_show()

Convert host commands to use intenal api:
"host list"
"host set"
"host show"

c)

The introduction of the Network-style commands into the server group
broke cliff's autoprogram directive as it executes the get_parser() methods
without fully initializing the Command object.

NOTE: This is really three reviews squashed to get through the gate in one pass.

Depends-on: Id6de87211d6c4ea8fd14aa9203d8d5b17e9e2f04
Change-Id: I5116086f9a9e4b2b31a744bf8f4558c79f0bfe59

This patch improves the error message by retrieving the more details
from the exception instance. Otherwise, the real error message won't
be displayed (unless using --debug in the command).

Change-Id: I8ba694bda86f7cc8362e301b2044d9b610dde49c

Problem: if a user issue the cmd 'openstack floating ip create public'
and has already maxed his quota for FIP, OSC exits with a not so useful
message:

>jordan@jordan-XPS13-9333:~ $ openstack floating ip create public
>HttpException: Conflict

This patches catch the HttpException earlier and prints a more
verbose message:

> jordan@jordan-XPS13-9333:~ $ openstack floating ip create public
> Error while executing command: Quota exceeded for resources: ['floatingip']

Change-Id: I7c87524d871d230d92f007c32e06439b34c7194a

Usually, the error message of multi delete is:
"'result' of 'total' 'objects' failed to delete"
the objects is a plural form.
To match the other multi delete error messages
in OSC, change the object in delete error message
in networkv2 to a plural form. Just add a 's' in
the message.

Change-Id: I17e0735d025bb61014db709d2639813565015b3d

Use file logger for all command specific logs.

This patch also fixes some usage that doesn't
follow rules in:
http://docs.openstack.org/developer/oslo.i18n/guidelines.html

After this patch, all self.log and self.app.log
will be standardized to LOG().

NOTE: In shell.py, we got the log in class OpenStackShell,
      which is also known as self.app.log in other classes.
      This logger is used to record non-command-specific logs.
      So we leave it as-is.

Change-Id: I114f73ee6c7e84593d71e724bc1ad00d343c1896
Implements: blueprint log-usage

Leave command.py and test_command.py as a sanity check during the
deprecation period.

Change-Id: I24e1b755cbfbcbcaeb5273ec0c9706b82384fc85

Use osc-lib directly for exceptions.

Leave openstackclient.common.exceptions for deprecation period.

Change-Id: Iea3e862302372e1b31ccd27f69db59b4953ca828

Some missing i18n problems in network.

Change-Id: I45a09a6ada1aad5a64256c0d0a0a2b6e250df670

This patch rework "network delete" command following the
rules in doc/source/command-errors.rst.

In "network delete" command, there are multiple REST API
calls, and we should make as many of them as possible.
And log error for each one, give a better error message.
Also return a non-zero exit code.

Change-Id: I39ae087dd7bd08d049d513abfa6c5cab2bd13b2b
Partial-Bug: #1556719