Make net.inet.ip.sourceroute, net.inet.ip.accept_sourceroute, and
net.inet.ip.process_options vnet-aware.  Revert changes in r271545.

Suggested by:	bz


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271610 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f