config: introduce hostname generation hooks

Overriding hostname in a .conf file, via base-files:

  HOST_NAME="k3s-host"
  hostname_pn-base-files = "${HOST_NAME}"

Is always a valid option, but if it is not configured, we can easily
have two hosts with the same name on the network, confusing adddress
assignement, etc.

This commit introduces a way to generate a unique hostname based
on the uuid of the build host, and the machine being built.

If virt-unique-hostname is added to IMAGE_FEATURES, like the following:

  IMAGE_FEATURES += "virt-unique-hostname"
  IMAGE_FEATURES[validitems] += "virt-unique-hostname"

Then a rootfs postprocessing hook will override hostnae to something
unique.

Note: this means your image will be reproducible on a single builder,
but not between them.

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

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