K 10
svn:author
V 7
zeising
K 8
svn:date
V 27
2020-09-26T16:27:09.747246Z
K 7
svn:log
V 288
bsdconfig, bsdinstall: Prune dead mirrors

Prune dead mirrors from the list of mirrors in bsdconfig and bsdinstall.
All these return NXDOMAIN when trying to resolve them.

Reviewed by:	emaste
Approved by:	emaste
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D26535

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