[query] Match graphite-web Graphite ** to allow for empty segment path selector to match elements #3366
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What this PR does / why we need it:
This matches the behavior of graphite-web to allow ** to match empty path segments (i.e.
foo.**.barshould match bothfoo.abc.barandfoo.bar).Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: