element.py: Expand variables in sandbox config (!1938) · Merge requests · BuildStream / buildstream · GitLab

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Jürg Billeter requested to merge juerg/expandsandbox into master May 27, 2020

This expands variables in project and element sandbox config.

This MR is a replacement for !1909 (closed), see !1909 (comment 339299442).

Fixes: #1303 (closed)