Add copy of tempest config for aio environment

Running tempest with the ``automated-setup.sh`` for ``aio`` environment
fails because it can't locate tempest override configuration for
``aio``.
Since ``ci-aio`` Kayobe environment inherits ``aio`` environment,
Renamed ``tempest-ci-aio.overrides.conf`` to
``tempest-aio.overrides.conf`` then made symlink to
``tempest-ci-aio.oerrides.conf`` to make them sync.

Author: seunghun1ee

.automation.conf/tempest/tempest-aio.overrides.conf

@@ -0,0 +1,2 @@
+[volume]
+catalog_type = volumev3

.automation.conf/tempest/tempest-ci-aio.overrides.conf

@@ -0,0 +1 @@
+tempest-aio.overrides.conf