ddb: space/tab fixes.

No functional change.

MFC after:	3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272958 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Rename s/network/netif/ and set netif_enable for namespace consistency.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272959 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f