test-serve: let run-tests.py kill the daemons

If the daemons die while the tests are still running, we'll get additional
"killed!" messages, making the test fail.

tests/test-serve

@@ -1,12 +1,12
 #!/bin/sh
 
 hg init test
 cd test
 
 echo % Without -v
 hg serve -a localhost -p 20063 -d --pid-file=hg.pid
-kill `cat hg.pid`
+cat hg.pid >> "$DAEMON_PIDS"
 
 echo % With -v
-hg serve -a localhost -p 20063 -d --pid-file=hg.pid -v
-kill `cat hg.pid`
+hg serve -a localhost -p 20064 -d --pid-file=hg.pid -v
+cat hg.pid >> "$DAEMON_PIDS"

tests/test-serve.out

@@ -1,3 +1,3
 % Without -v
 % With -v
-listening at http://localhost:20063/
+listening at http://localhost:20064/