Revert "Remove maximal_delay from commandline options."

This reverts commit 9f133c68.

slapos/grid/slapgrid.py

@@ -111,6 +111,8 @@ def parseArgumentTupleAndReturnSlapgridObject(*argument_tuple):
       help="Promise timeout in seconds.")
   parser.add_argument("configuration_file", nargs=1, type=argparse.FileType(),
       help="SlapOS configuration file.")
+  parser.add_argument("--maximal_delay", help="The maximal delay value in seconds. " \
+                    "A negative value leads start immediately.")
   parser.add_argument("--now", action="store_true", default=False,
       help="Launch slapgrid without delay.")
   parser.add_argument("--develop", action="store_true", default=False,