Michael Paquier 0d1a33438d Move some client-specific routines from SSLServer to PostgresNode
test_connect_ok() and test_connect_fails() have always been part of the
SSL tests, and check if a connection to the backend should work or not,
and there are sanity checks done on specific error patterns dropped by
libpq if the connection fails.

This was fundamentally wrong on two aspects.  First, SSLServer.pm works
mostly on setting up and changing the SSL configuration of a
PostgresNode, and has really nothing to do with the client.  Second,
the situation became worse in light of b34ca595, where the SSL tests
would finish by using a psql command that may not come from the same
installation as the node set up.

This commit moves those client routines into PostgresNode, making easier
the refactoring of SSLServer to become more SSL-implementation aware.
This can also be reused by the ldap, kerberos and authentication test
suites for connection checks, and a follow-up patch should extend those
interfaces to match with backend log patterns.

Author: Michael Paquier
Reviewed-by: Andrew Dunstan, Daniel Gustafsson, Álvaro Herrera
Discussion: https://postgr.es/m/YGLKNBf9zyh6+WSt@paquier.xyz
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PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
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The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
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Description
Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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