Change a bit cvsps arguments

Change a bit cvsps arguments

- Force updating the cache
- Use internal cvs implementation, reducing overhead
- Use quiet mode

--- a/contrib/convert-repo	Fri Feb 23 17:31:00 2007 +0100
+++ b/contrib/convert-repo	Wed Feb 21 00:38:06 2007 +0100
@@ -85,7 +85,7 @@
             os.chdir(self.path)
             id = None
             state = 0
-            for l in os.popen("cvsps -A"):
+            for l in os.popen("cvsps -A -u --cvs-direct -q"):
                 if state == 0: # header
                     if l.startswith("PatchSet"):
                         id = l[9:-2]