Add support for running without namespaces

nfv-test-api creates namespaces for two reasons:

To model customer routers
To protect the network stack of the vm it runs on

When using nfv-test-api with something like container lab, we use nfv-test-api as the customer equipment in a dedicated container. Because of the namespaces this requires privileged containers.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information