Add tempest tests for volume retype with migration

This patch proposes to add a test to test volume migration
from one backend to another. Before running the tests,
please configure your local cinder deployment with a proper
multi-backend support.

[volume]
backend_names = lvmdriver-1,lvmdriver-2

[volume_feature_enabled]
multi_backend = True

A minimum of two backends are required. The test will migrate the volume
from the first to the second backend in the list. Other backends will
be ignored.

This test can be tested by 'check experimental' and must run and pass
the job'lvm-multibackend'.

Change-Id: Iff4d880a0f8e928cbc07b84ff0c357ad59ef929c
Partial-Implements: blueprint migration-improvement
Co-Authored-By: Scott DAngelo <scott.dangelo@hpe.com>
Co-Authored-By: Erlon Cruz <erlon.cruz@fit-tecnologia.org.br>
1 file changed