test-serve: wait before killing to always hide the "killed!" message.

Without the sleeps slower systems never display never display "killed!"
while faster systems sometimes or nearly always display it.

tests/test-serve

@@ -16,24 +16,28 b' fi'
 echo % With -v
 hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid -v | sed -e 's,:[0-9][0-9]*/,/,'
 cat hg.pid >> "$DAEMON_PIDS"
+sleep 1
 kill `cat hg.pid`
 sleep 1
 
 echo % With --prefix foo
 hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid -v --prefix foo | sed -e 's,:[0-9][0-9]*/,/,'
 cat hg.pid >> "$DAEMON_PIDS"
+sleep 1
 kill `cat hg.pid`
 sleep 1
 
 echo % With --prefix /foo
 hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid -v --prefix /foo | sed -e 's,:[0-9][0-9]*/,/,'
 cat hg.pid >> "$DAEMON_PIDS"
+sleep 1
 kill `cat hg.pid`
 sleep 1
 
 echo % With --prefix foo/
 hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid -v --prefix foo/ | sed -e 's,:[0-9][0-9]*/,/,'
 cat hg.pid >> "$DAEMON_PIDS"
+sleep 1
 kill `cat hg.pid`
 sleep 1
 

tests/test-serve.out

@@ -2,15 +2,11 b''
 access log created - .hg/hgrc respected
 % With -v
 listening at http://localhost/
-killed!
 % With --prefix foo
 listening at http://localhost/foo/
-killed!
 % With --prefix /foo
 listening at http://localhost/foo/
-killed!
 % With --prefix foo/
 listening at http://localhost/foo/
-killed!
 % With --prefix /foo/
 listening at http://localhost/foo/