tree 25d7ece36a2636473481204e49bb477f778e28f6
parent ac6ce0005e2600833f5313ed18ed0684eb36b6fa
author zhufl <zhu.fanglei@zte.com.cn> 1514877519 +0800
committer zhufl <zhu.fanglei@zte.com.cn> 1514877519 +0800

Support only volume api_v3 is enabled

Now if we set CONF.volume_feature_enabled.api_v2 to False while
setting CONF.volume_feature_enabled.api_v3 to True, some testcases
can't work properly, e.g., in scenario.manager.py, we have
    "if not client:
        client = self.os_admin.volume_types_v2_client"

In fact, we should support only volume api_v3 is enabled, which means
to run all volume testcases using v3 interfaces(not only those new
functions added in v3).

So this is to transfer all volume v2 clients to using v3 interfaces
if only api_v3 is enabled.

Change-Id: I6924f295bcc84797e3c59f8cc4b68c1e251b931d