Fix invalid values when setting config options' default value
Fix invalid values when setting config options' default value

Config options v3_endpoint_type, v2_public_endpoint_type and
v2_admin_endpoint_type only allow dedicated values[1],
oslo.config 4.0 will check overridden value type by default[2],
so need remove invalid overridden values.

[1] https://github.com/openstack/tempest/blob/0d93900ba6d7daaebb1886918573431af3af50dc/tempest/config.py#L145-L164
[2] https://review.openstack.org/#/c/328692/

Closes-Bug: #1517839

Change-Id: I86cc9e53b86a69357254b68ba564df716a2284a5

vedujoshi/tempest,openstack/tempest,masayukig/tempest,cisco-openstack/tempest,Juniper/tempest,openstack/tempest,cisco-openstack/tempest,Juniper/tempest,vedujoshi/tempest,masayukig/tempest