MFC r196835:   Allow a jail's name to be the same as its jid (which is the default if   no name is specified), and let a numeric name specify the jid for a new   jail when the jid isn't otherwise set.  Still disallow other numeric   names.
MFC r196835:
  Allow a jail's name to be the same as its jid (which is the default if
  no name is specified), and let a numeric name specify the jid for a new
  jail when the jid isn't otherwise set.  Still disallow other numeric
  names.

Reviewed by:	zec
Approved by:	re (kib), bz (mentor)

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