tests: update k3s multi-node to use kernel cmdline role setupmaster-next

Update the multi-node test fixture to use kernel cmdline parameters
(k3s.role, k3s.node-ip, k3s.node-name) instead of manual IP
configuration and k3s restart. The k3s-role-setup.service handles
networking and role switching automatically on boot.

- Pass kernel_append to K3sRunner for k3s.role and k3s.node-ip
- Remove manual ip-addr-add and k3s stop/restart from fixture
- Use k3s-get-token helper to extract join token on server
- Agent starts k3s agent manually with extracted token (token
  not known at boot time)
- Remove _QEMU_ARCH_CONFIG dict (moved to run-qemu-vm.sh script)

All 10 tests pass: 5 single-node + 5 multi-node.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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