container tasks: move network access out of build chain

yocto-check-layer reports an error for any task between do_fetch and
do_build that has network enabled. Two changes fix this:

container-bundle.bbclass: Move do_fetch_containers from a standalone
task into a do_fetch postfunc. When remote containers are configured,
the anonymous function adds extend_recipe_sysroot as a do_fetch
prefunc (so skopeo-native is available) and do_fetch_containers as a
postfunc. Network access during do_fetch is permitted by the QA check.

container-registry-index: Remove do_container_registry_index from the
build dependency chain (drop "before do_build"). Registry push is a
deployment action requiring explicit invocation:
  bitbake container-registry-index -c container_registry_index
The default do_build task now prints usage instructions.

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

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