Small improvement for plpgsql regression test.

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

Commit: 7d5b403b8d418742b734f85fda32b0eca8ee4113
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-05-18T16:10:26Z
Releases: 11.0
Small improvement for plpgsql regression test.

Use DISCARD PLANS instead of a reconnect to force reconstruction of
a cached plan; this corresponds more nearly to what people might
actually do in practice.

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