Change the default log level for iSCSI target from 3 to 1.  It should
have been 1 from the beginning; not sure how it ended up at 3.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273918 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f