Mock openstacksdk raise_from_response in ironic unit test
Mock openstacksdk raise_from_response in ironic unit test

Mocking the openstacksdk exception method raise_from_response
to prevent random error messages even in succeded unit
tests.
An example:
https://zuul.opendev.org/t/openstack/build/943c3f89519c44a58e0b5c86ad4efff8/log/job-output.txt#23782-23789

Change-Id: I3d9128d6712b4094c0b2ad7e12db9e5a915e3d91
Closes-Bug: #1848147

mahak/neutron,openstack/neutron,openstack/neutron,mahak/neutron,openstack/neutron,mahak/neutron