Work-around failing tests/test-bad-pull with slow bg process.

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Work-around failing tests/test-bad-pull with slow bg process.
Without the 'sleep 2' python dumb.py often appeared after hg clone.

manifest hash: b32381ac46a7691f2a92595b650b2406853644c2
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tests/test-bad-pull

@@ -1,26 +1,27 b''
 #!/bin/sh -x
 
 hg clone http://localhost:20059/ copy
 echo $?
 ls copy
 
 cat > dumb.py <<EOF
 import BaseHTTPServer, SimpleHTTPServer, signal
 
 def run(server_class=BaseHTTPServer.HTTPServer,
         handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
     server_address = ('localhost', 20059)
     httpd = server_class(server_address, handler_class)
     httpd.serve_forever()
 
 signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
 run()
 EOF
 
 python dumb.py 2>/dev/null &
+sleep 2
 
 hg clone http://localhost:20059/foo copy2
 echo $?
 
 set +x
 kill $!

tests/test-bad-pull.out

@@ -1,20 +1,22 b''
 + hg clone http://localhost:20059/ copy
 requesting all changes
 adding changesets
 abort: error 111: Connection refused
 transaction abort!
 rollback completed
 + echo 255
 255
 + ls copy
+ls: copy: No such file or directory
 + cat
++ sleep 2
 + python dumb.py
 + hg clone http://localhost:20059/foo copy2
 requesting all changes
 adding changesets
 abort: HTTP Error 404: File not found
 transaction abort!
 rollback completed
 + echo 255
 255
 + set +x