data_smart: Ensure hash reflects vardepvalue flags correctly

The get_hash() function is used to decide if the base configuration has changed
and hence whether a reparse is required. The vardepvalue flag's value was not
expanded but it is often used in contexts like:

METADATA_REVISION = "${@base_detect_revision(d)}"
METADATA_REVISION[vardepvalue] = "${METADATA_REVISION}"

which in it's unexpanded form means reparsing doesn't happen when it should
as the data appears unchanged. Update get_hash to expand the values of
vardepvalue so reparsing works as expected. This avoids basehash mismatch
errors such as the one recently caused by using METADATA_REVISION in poky.conf's
DISTRO_VERSION variable. The issue there could be exposed by a recipe using
DISTRO_VERSION with the sequence:

bitbake os-release
<change the revision of the metadata with a dummy commit>
bitbake os-release -C install

which was caused because METADATA_REVISION changed but the metadata didn't reparse.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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