Use non-conflicting table names in new regression test case.

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

Commit: 7fa7bf18e493e130147e62cf7dc33010f164126c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-01-25T00:02:22Z
Releases: 10.0
Use non-conflicting table names in new regression test case.

Commit 587cda35c added a test to updatable_views.sql that created
tables named the same as tables used by the concurrent inherit.sql
script.  Unsurprisingly, this results in random failures.
Pick different names.

Per buildfarm.

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