tests: kill some test servers afterwards to avoid locked logfiles

Reviewed-by: Daniel Stenberg
Closes #7925

tests/data/test1272

@@ -22,6 +22,9 @@ iMenu results		error.host	1
 <server>
 gophers
 </server>
+<killserver>
+gophers
+</killserver>
  <name>
 Gophers index
  </name>

tests/data/test1273

@@ -44,6 +44,9 @@ Content-Length: 0
 <server>
 http
 </server>
+<killserver>
+http
+</killserver>
  <name>
 -f and resume transfer of an entirely-downloaded file
  </name>

tests/data/test1561

@@ -65,6 +65,9 @@ SSL
 http
 https
 </server>
+<killserver>
+https
+</killserver>
 <name>
 Cookies set over HTTP can't override secure ones
 </name>