Change the hardcoded default back from SHA512 to DES.

PR:		192277
MFC after:	3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272830 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Shuffle things.

Suggested by:	jhb

Differential Revision:	D906
Sponsored by:	Norse Corp


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272831 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f