We do this because most of our sample tests are currently using a fake
network cache due to 'stub_compute_with_ips', and that fake cache uses
the name 'private' instead of 'private-network'. When we remove that in
a future change, there's going to be a lot of refactoring. Head some of
that off by just using the same name.
Change-Id: I6339005a0d49a6dfd376523d3f9e145a00cfc3bd
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>