MFC rev. 1.11:
MFC rev. 1.11:

Revert to setting vlan and vlandev parametes synchronously, as soon
as both have been read from the command line.  Still use the callback,
but this time only to verify that both vlan and vlandev have been
found on the command line.

This should allow for control over the relative order of processing
parameters, which is needed to satisfy some caveats of the if_vlan
driver.  E.g., MTU cannot be changed on a vlan interface until it's
attached to its parent.

Approved by:	re (scottl)

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