Remove abstime, reltime, tinterval tables from old regression databases.

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

Commit: 7b88c1ddd049de7ebddd39ad70ebdc7286be299d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-10-12T23:33:57Z
Releases: 9.4.20
Remove abstime, reltime, tinterval tables from old regression databases.

In the back branches, drop these tables after the regression tests are
done with them.  This fixes failures of cross-branch pg_upgrade testing
caused by these types having been removed in v12.  We do lose the ability
to test dump/restore behavior with these types in the back branches, but
the actual loss of code coverage seems to be nil given that there's nothing
very special about these types.

Discussion: https://postgr.es/m/20181009192237.34wjp3nmw7oynmmr@alap3.anarazel.de

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