Try to harden insert-conflict-specconflict against autovacuum.

Andres Freund <andres@anarazel.de>

Commit: 997563dfcb2501a7a199589cd6f15f2bb8af3d04
Author: Andres Freund <andres@anarazel.de>
Date: 2020-02-12T05:18:14Z
Releases: 13.0
Try to harden insert-conflict-specconflict against autovacuum.

Looks like guaibasaurus had a autovacuum running during the
controller_print_speculative_locks step (just added in
43e08419708). Which does indeed seem quite possible.

Avoid the problem by only looking for the backends participating in
the test.

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