Make auth_uri available in the swift test setup

The swift functional tests use a config which requires keystone ports,
we're about to make those go away. This exposes the actual auth_uri to
swift for consumption.

Change-Id: I5868dfdb8e5f0972ba04e359d212b04351502436
diff --git a/lib/swift b/lib/swift
index 96e2f03..5eac904 100644
--- a/lib/swift
+++ b/lib/swift
@@ -538,6 +538,7 @@
         auth_vers=$(iniget ${testfile} func_test auth_version)
         iniset ${testfile} func_test auth_host ${KEYSTONE_SERVICE_HOST}
         iniset ${testfile} func_test auth_port ${KEYSTONE_AUTH_PORT}
+        iniset ${testfile} func_test auth_uri ${KEYSTONE_AUTH_URI}
         if [[ $auth_vers == "3" ]]; then
             iniset ${testfile} func_test auth_prefix /v3/
         else