Remove remnants of BIND from /etc, since there is no BIND in base now.

Sorry, that would break users running head and BIND from ports, since
ports rely on these scripts. The ports will be fixed soon.

Reviewed by:	erwin
- Fix link loss on vlan reconfiguration.
- Fix issues with 'vlanhwfilter'.

MFC after:	1 week
Silence from:	jfv 5 weeks