vcontainer: add BBMASK for parse savings and suppress layer warnings

The initial vcontainer distro had no BBMASK at all, making it
effectively poky with fewer DISTRO_FEATURES. Every multiconfig parsed
the entire recipe universe even though container image builds only
need a small subset. With 4+ multiconfigs, the parse overhead is
significant.

Add vcontainer-bbmask.inc as a lighter alternative to vruntime's
aggressive BBMASK. It masks the same categories irrelevant to any
container/VM build (graphics, multimedia, desktop, virtualization
platforms, orchestration tools, meta-python, meta-filesystems,
meta-webserver) but keeps the OCI tooling that vruntime blocks:
umoci, container-registry, image recipes, sloci, oci-image-tools.

Masking entire layers (meta-python, meta-filesystems, meta-webserver)
produces BBFILE_PATTERN warnings because the layers are registered in
bblayers.conf (shared with the main build) but have zero recipes after
masking. BitBake provides BBFILE_PATTERN_IGNORE_EMPTY_<collection>
to suppress this, but checks it on self.data (the base datastore),
not per-multiconfig datastores. Setting it in the distro config has
no effect. Move the suppression to meta-virt-host.conf which is
included by the main build's local.conf and therefore visible to
the base datastore.

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

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