test-lfs: allow the test server to be killed on Windows

Apparently '$!' doesn't return a Win32 PID, so the process was never killed, and
the next run was screwed up.  Oddly, without the explicit killdaemons.py at the
end, the test seems to hang.  This spawning is just sad, so I limited it to
Windows.

tests/test-lfs-test-server.t

@@ -4,8 +4,26 b''
   $ LFS_HOST="localhost:$HGPORT"
   $ LFS_PUBLIC=1
   $ export LFS_LISTEN LFS_HOST LFS_PUBLIC
+#if no-windows
   $ lfs-test-server &> lfs-server.log &
   $ echo $! >> $DAEMON_PIDS
+#else
+  $ cat >> $TESTTMP/spawn.py <<EOF
+  > import os
+  > import subprocess
+  > import sys
+  > 
+  > for path in os.environ["PATH"].split(os.pathsep):
+  >     exe = os.path.join(path, 'lfs-test-server.exe')
+  >     if os.path.exists(exe):
+  >         with open('lfs-server.log', 'wb') as out:
+  >             p = subprocess.Popen(exe, stdout=out, stderr=out)
+  >             sys.stdout.write('%s\n' % p.pid)
+  >             sys.exit(0)
+  > sys.exit(1)
+  > EOF
+  $ $PYTHON $TESTTMP/spawn.py >> $DAEMON_PIDS
+#endif
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
@@ -104,3 +122,5 b' Check error message when object does not'
   updating to branch default
   abort: LFS server error. Remote object for file data/a.i not found:(.*)! (re)
   [255]
+
+  $ $PYTHON $RUNTESTDIR/killdaemons.py $DAEMON_PIDS