Show version of nodes in output of TAP tests

This commit adds the version information of a node initialized by Cluster.pm, that may vary depending on the install_path given by the test. The code was written so as the node information, that includes the version number, was dumped before the version number was set. This is particularly useful for the pg_upgrade TAP tests, that may mix several versions for cross-version runs. The TAP infrastructure also allows mixing nodes with different versions, so this information can be useful for out-of-core tests. Backpatch down to v15, where Cluster.pm and the pg_upgrade TAP tests have been introduced. Author: Potapov Alexander <a.potapov@postgrespro.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/e59bb-692c0a80-5-6f987180@170377126 Backpatch-through: 15

Author: michaelpq

src/test/perl/PostgreSQL/Test/Cluster.pm

@@ -1647,10 +1647,10 @@ sub new
  or
  BAIL_OUT("could not create data directory \"$node->{_basedir}\": $!");
 
-$node->dump_info;
-
 $node->_set_pg_version;
 
+$node->dump_info;
+
 my $ver = $node->{_pg_version};
 
 # Use a subclass as defined below (or elsewhere) if this version