tests: stop killing (most) https servers individually

This is easier to manage, and avoids one nested conditional.  There is one final
sweep of killing individual servers near the end, but that's left alone because
there's a comment about not killing `tinyproxy.py`, due to potentially emitting
additional output.

tests/test-https.t

@@ -335,9 +335,7 Fingerprints
 
 Ports used by next test. Kill servers.
 
-  $ killdaemons.py hg0.pid
-  $ killdaemons.py hg1.pid
-  $ killdaemons.py hg2.pid
+  $ killdaemons.py $DAEMON_PIDS
 
 #if tls1.2
 Start servers running supported TLS versions
@@ -465,12 +463,7 The per-host config option by itself wor
   abort: error: .*(unsupported protocol|wrong ssl version|alert protocol version).* (re)
   [100]
 
-  $ killdaemons.py hg0.pid
-  $ killdaemons.py hg1.pid
-  $ killdaemons.py hg2.pid
-#if tls1.3
-  $ killdaemons.py hg3.pid
-#endif
+  $ killdaemons.py $DAEMON_PIDS
 #endif
 
 Prepare for connecting through proxy