Add trailing IDENTITY_API_VERSION to OS_AUTH_URL in swift_configure_tempurls

The python-keystoneclient requires a trailing /v<IDENTITY_API_VERSION> to
successfully authenticate, otherwise it fails with a 404 error due to a not
found resource.

This error showed up only when generating Swift tempurls, because the error was
raised when using python-swiftclient.

This change fixes this for python-swiftclient within devstack.

Change-Id: Ibe222d65162898db69acba076b5fe1cb3621fbc3
Closes-Bug: 1492216
diff --git a/lib/swift b/lib/swift
index 6b61274..645bfd7 100644
--- a/lib/swift
+++ b/lib/swift
@@ -801,6 +801,7 @@
     OS_USERNAME=swift \
         OS_TENANT_NAME=$SERVICE_TENANT_NAME \
         OS_PASSWORD=$SERVICE_PASSWORD \
+        OS_AUTH_URL=$KEYSTONE_AUTH_URI/v$IDENTITY_API_VERSION \
         swift post -m "Temp-URL-Key: $SWIFT_TEMPURL_KEY"
 }