Rework the stats_ext test

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: bed9ef5a16239d91d97a1fa2efd9309c3cbbc4b2
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2017-03-27T15:43:04Z
Releases: 10.0
Rework the stats_ext test

As suggested by Tom Lane, avoid printing specific estimated cost values,
because they vary across architectures; instead, verify plan shapes (in
this case, HashAggregate vs. GroupAggregate), as we do in other planner
tests.

We can now remove expected/stats_ext_1.out.

Author: Tomas Vondra

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