Permit functional tests against Swift with Keystone

While poking at such problems with authentication other than swauth
it was useful to allow stock functional tests running back-to-back
at two clusters, with tempauth and Keystone.

When running the legacy tests, this version packs account into user
the way it was down previously. This way we do not need to repack
them before every call to get_auth. The downside is additional work
to be done when setting ACLs.

Change-Id: Ieb1d9227cb88977ecd2c39825039bc4be8afae0b
Merge "Permit functional tests against Swift with Keystone"