tests: fix k3s multi-node test suite

Fix several issues discovered during multi-node testing:

- Find native QEMU binary from build sysroots-components instead of
  relying on PATH (qemu-system-native is not in OE build env PATH)
- Set LD_LIBRARY_PATH for native QEMU shared library dependencies
  (libSDL2, etc. from native sysroots)
- Add if=virtio to drive parameter so root device appears as /dev/vda
- Add CNI bin dirs to PATH when starting k3s manually (systemd service
  has the PATH fix but manual launch does not)
- Wipe server TLS/cred/db state and kubeconfig before restarting with
  cluster IPs to avoid stale certificate errors (cert only valid for
  DHCP IP, not 192.168.50.1)
- Add --tls-san for cluster IP to server start
- Wipe agent k3s state to avoid "not authorized" from stale tokens
- Remove server-only config.yaml on agent (disable-cloud-controller
  flag crashes the agent)
- Set unique --node-name on agent to prevent hostname collision when
  both VMs boot from the same image

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

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