Patchset fixes calculating EC2_URL/S3_URL for user rc files in 'accrc' directory.
Currently calculation of these url's uses 'openstack endpoint show' command
without specifying os-identity-v3 flag. But output is empty without such flag.
So this patchset uses same construction as exists in functions-common.
Change-Id: Ia4f2510750fa0f46e2f1d58cf0a7a16782f022b3