MFS r267876 (MFC r267616):

MFS r267876 (MFC r267616):

Retooling addrconfig() to exclude addresses on loopback interfaces
when looking for configured addresses.
This change is based upon the code from the submitter, and made
following changes:
- Exclude addresses assigned on interfaces which are down, like NetBSD
  does.
- Exclude addresses assigned on interfaces which are ifdisabled.

PR:		190824
Submitted by:	Justin McOmie
Approved by:	re (marius)

git-svn-id: svn://svn.freebsd.org/base/releng/9.3@268106 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f