Adding feature to define domain_specific_drivers

The patch make a possibility to define domain_specific_drivers parameter in
section [identity-feature-enabled] for tempest in case of external domain
is used in keystone.

Change-Id: Iaf7a8f8aee7afb82ee4fb74d1934acc8fe861de2
Related-PROD: PROD-26288 (PROD:26288)
1 file changed