Neutron agent delete: remove the wrong argument

[PerToft]

Openstack-Ansible Brach: 16.0.8
Openstack release: Pike
Package: python-openstackclient

Upstream bug:
https://bugs.launchpad.net/python-openstackclient/+bug/1711301
https://review.openstack.org/#/c/518371/

Steps to reproduce:
root@cloudbc1bl01-utility-container-ed3d41af:~# openstack network agent delete 25c683d3-b4f0-4cda-9255-69d30c2bbea9
Failed to delete network agent with ID '25c683d3-b4f0-4cda-9255-69d30c2bbea9': get_agent() got an unexpected keyword argument 'ignore_missing'
1 of 1 network agents failed to delete.
root@cloudbc1bl01-utility-container-ed3d41af:~#

Bug corrected by following instructions in the review and change the /usr/local/lib/python2.7/dist-packages/openstackclient/network/v2/network_agent.py.

I have manually changed the files and it resolves the bug.

[Jean-Philippe Evrard (jean-philippe-evrard)]

In 16.0.8 and 16.0.9, we are stuck with the version 3.12 of python-openstackclient due to the requirements process (https://github.com/openstack/requirements/blob/54d1a42531aadf9ed166961566c676d9ac3e1521/upper-constraints.txt#L428).

We shouldn't bump the version, as it would break other things.

In the future we might have a way to have heterogenous environment with different versions of python-openstackclient, but it's not the case for now.