Make isolation_update_node test system independent

Improve already existing rule to normalize test output and use it.

src/test/regress/bin/normalize.sed

@@ -215,7 +215,7 @@ s/^(ERROR:  The index name \(test_index_creation1_p2020_09_26)_([0-9])+_(tenant_
 s/^(DEBUG:  the index name on the shards of the partition is too long, switching to sequential and local execution mode to prevent self deadlocks: test_index_creation1_p2020_09_26)_([0-9])+_(tenant_id_timeperiod_idx)/\1_xxxxxx_\3/g
 
 # normalize errors for not being able to connect to a non-existing host
-s/could not translate host name "foobar" to address: .*$/could not translate host name "foobar" to address: <system specific error>/g
+s/could not translate host name "([A-Za-z0-9\.\-]+)" to address: .*$/could not translate host name "\1" to address: <system specific error>/g
 
 # ignore PL/pgSQL line numbers that differ on Mac builds
 s/(CONTEXT:  PL\/pgSQL function .* line )([0-9]+)/\1XX/g

src/test/regress/expected/isolation_update_node.out

@@ -250,7 +250,7 @@ count
 step s1-commit-prepared:
     COMMIT prepared 'label';
 
-s2: WARNING:  connection to the remote node non-existent:57637 failed with the following error: could not translate host name "non-existent" to address: Name or service not known
+s2: WARNING:  connection to the remote node non-existent:57637 failed with the following error: could not translate host name "non-existent" to address: <system specific error>
 step s2-execute-prepared:
     EXECUTE foo;