classes/yocto-check-layer: add check for tasks that allow network access

Add a new test that checks that no tasks between do_fetch (exclusive)
and do_build (inclusive) are allowed to use the network, with rare
exceptions.

The only exception currently is build-appliance-image's do_image task,
as that currently usese pip to install the required Toaster dependencies.

Note that this will mean layers that have Go-based recipes will fail
unless they're using the gomod fetcher and have a complete list of
modules in the SRC_URI.

(From OE-Core rev: e95b3bd194e294412bc0419c9c74abfc2f37406f)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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