PostgresNode: Add names to nodes

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: c8642d909fdd57c36dd71e0b0bb4071523324794
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2016-01-20T17:13:11Z
Releases: 9.6.0
PostgresNode: Add names to nodes

This makes the log files easier to follow when investigating a test
failure.

Author: Michael Paquier
Review: Noah Misch

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