FreeBSD/src 2e20211 (r348055)libexec/rc rc.conf, sbin/ifconfig ifconfig.8

Revert r348012, MFC r347963.

Several of the changes touch actual defaults. These defaults are all
mistakes and no one should rely on them, but changing them in a stable
branch is clearly inappropriate.

Reported by:    rgrimes
DeltaFile
+24-24share/man/man5/rc.conf.5
+15-15libexec/rc/rc.conf
+8-8sbin/ifconfig/ifconfig.8
+2-2tools/tools/tinybsd/conf/firewall/etc/rc.firewall
+2-2usr.sbin/jail/jail.8
+51-515 files

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