Always kill web servers used in tests

Previously these processes would stay around if the test script crashed
or was otherwise aborted before reaching the kill command.

contrib/pg_tde/t/003_remote_config.pl

@@ -49,6 +49,7 @@ use pgtde;
 }
 
 my $pid = MyWebServer->new(8888)->background();
+END { kill('TERM', $pid); }
 
 PGTDE::setup_files_dir(basename($0));
 
@@ -85,8 +86,6 @@ PGTDE::psql($node, 'postgres', 'DROP EXTENSION pg_tde;');
 
 $node->stop;
 
-kill('TERM', $pid);
-
 # Compare the expected and out file
 my $compare = PGTDE->compare_results();
 

contrib/pg_tde/t/006_remote_vault_config.pl

@@ -58,6 +58,7 @@ use pgtde;
 }
 
 my $pid = MyWebServer->new(8889)->background();
+END { kill('TERM', $pid); }
 
 PGTDE::setup_files_dir(basename($0));
 
@@ -94,8 +95,6 @@ PGTDE::psql($node, 'postgres', 'DROP EXTENSION pg_tde;');
 
 $node->stop;
 
-kill('TERM', $pid);
-
 # Compare the expected and out file
 my $compare = PGTDE->compare_results();