Use just one database connection in the "tablespace" test.

Noah Misch <noah@leadboat.com>

Commit: 28245b8424e29808f4f714482077a762cab0c5c5
Author: Noah Misch <noah@leadboat.com>
Date: 2014-11-12T12:33:17Z
Releases: 9.5.0
Use just one database connection in the "tablespace" test.

On Windows, DROP TABLESPACE has a race condition when run concurrently
with other processes having opened files in the tablespace.  This led to
a rare failure on buildfarm member frogmouth.  Back-patch to 9.4, where
the reconnection was introduced.

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