Allow v2 client authentication with trust_id

It should be possible to authenticate against the v2 tokens
API with a trust_id, because it suports rescoping an existing
token to a trust, this patch adds client support for this.

Note with the current keystone code it's necessary to pass the
trustor tenant ID when rescoping with a trust where
impersonation==True, e.g:

c = client_v2.Client(username=TRUSTEE_USERNAME,
                     password=TRUSTEE_USERNAME,
                     tenant_name=TRUSTEE_TENANT_NAME,
                     auth_url=OS_AUTH_URL_V2)
c.authenticate(trust_id=trust_i.id, tenant_id=TRUSTOR_TENANT_ID)

Change-Id: I177c41af298b7437e2c6fb437aa9ce9a09773b9d
Closes-Bug: #1231483

1 files changed, 2 insertions, 2 deletions

diff --git a/keystoneclient/access.py b/keystoneclient/access.py
index 53cb0ff..e54e986 100644
--- a/keystoneclient/access.py
+++ b/keystoneclient/access.py
@@ -391,11 +391,11 @@ class AccessInfoV2(AccessInfo):
 
     @property
     def trust_id(self):
-        return None
+        return self.get('trust', {}).get('id')
 
     @property
     def trust_scoped(self):
-        return False
+        return 'trust' in self
 
     @property
     def project_id(self):