lib/oe/recipeutils: properly split unexpanded variable values

Variables such as SRC_URI which are space-separated may also contain
Python expressions (${@...}) which themselves contain spaces that
shouldn't be split when splitting the value into items. In order to
ensure this we need to use a custom splitting function instead of just
string.split().

This issue could be seen when doing "devtool modify sudo", adding a
commit to the resulting source repository then "devtool update-recipe" -
the Python expression in SRC_URI was being unnecessarily broken onto
multiple lines.

Fixes [YOCTO #8046].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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