rm_work_and_downloads.bbclass: more aggressively minimize disk usage

rm_work.bbclass never deletes downloaded files, even if they are not
going to be needed again during the
build. rm_work_and_downloads.bbclass is more aggressive in minimizing
the used disk space during a build, but has other disadvantages:
- sources required by different recipes need to be fetched once per
  recipe, not once per build
- incremental builds do not work reliably because sources get
  removed without ensuring that sources gets fetched again

That makes rm_work_and_downloads.bbclass useful for one-time builds in
a constrained environment (like a CI system), but not for general use.

(From OE-Core rev: ca23a07fc6677720508197f2b44573bfd6b52f28)

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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