fixed cert generation

vpngen.py

         self.setup_vars(vpn_name, variables)
 
         call([".%sclean-all" % os.sep])
-        call([pkitool, "--initca"])
+        call([pkitool, "--initca", "-batch"])
         call([pkitool, "server", "-batch"])
         call([".%sbuild-dh" % os.sep])
         call(["openssl", "ca", "-gencrl",