oslo-incubator was deprecated and all modules used by novaclient were
removed from oslo-incubator master branch. This patch removes all unused
code from novaclient's repo.
Change-Id: Ie3c542d19da6ed4d25ec490faf6a86a82f48cd34
Module `novaclient.utils` contains a lot of functions which are
presented in modules from common code.
* service_type -> novaclient.openstack.common.cliutils.service_type
* get_service_type -> novaclient.openstack.common.cliutils.get_service_type
* pretty_choice_list ->
novaclient.openstack.common.cliutils.pretty_choice_list
* import_class -> oslo.utils.importutils.importclass
* HookableMixin -> novaclient.openstack.common.apiclient.base.HookableMixin
Change-Id: Ia6cac058da12c852d92f26875a66ae31cc4c63d4