Networking for containers so they can ping each other in multihost scenario

[lukaszachy]

Currently they are not able to do so. @kkaarreell pointed out his solution in https://github.com/RedHat-SP-Security/keylime-tests/blob/main/container/functional/keylime_verifier_registrar_container-basic-attestation/test.sh#L26 and https://github.com/RedHat-SP-Security/keylime-tests/blob/main/Library/test-helpers/lib.sh#L1910

Seems we can create a new network for the whole plan and assign it to the containers . 'multihost' plugin can inspect the IP and fill the /etc/hosts properly.

Short experiment:
podman network create --disable-dns FOO_NAME followed by podman run --net FOO_NAME.
The inspect should look into {{json .NetworkSettings.Networks.FOO_NAME.IPAddress}}

On my machine (fedora 37) I didn't need to specify subnet when creating network however without --disable-dns containers where not able to resolve url for fedora repositories.