Deprecate `volume_image_dep_tests`

Cinder-tempest-plugin have local configuration setting for dependency
tests.
Cinder dependency tests will align with tempest configuration settings
`enable_volume_image_dep_tests`

Change-Id: I1c77e6ebbb4a33536b45870ac605b6c762150bef
diff --git a/tempest/config.py b/tempest/config.py
index 471782b..0d691b9 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -1110,6 +1110,7 @@
                help='Volume types used for data volumes. Multiple volume '
                     'types can be assigned.'),
     cfg.BoolOpt('enable_volume_image_dep_tests',
+                deprecated_name='volume_image_dep_tests',
                 default=True,
                 help='Run tests for dependencies between images, volumes'
                 'and instance snapshots')