Add regression test to catch future breakage of avg(interval). This

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 78b674ba35d35836b7ff6eac9e22d92ab5e3f2bd
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-05-18T16:02:01Z
Releases: 7.2.1
Add regression test to catch future breakage of avg(interval).  This
aggregate seems uniquely fragile, because it's the only one with an
agginitval that's at all likely to change in format.

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