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nanobsd: Use gpart and create code image before full disk image

The attached patch brings two main changes to the nanobsd script:
 1- gpart is used instead of fdisk;
 2- the code image is created first, and then used to ``assemble'' the
    full disk image.

The patch was first proposed on the freebsd-embedded list:
http://lists.freebsd.org/pipermail/freebsd-embedded/2012-June/001580.html
and is currently under discussion:
http://lists.freebsd.org/pipermail/freebsd-embedded/2014-January/002216.html

Another effect is that the -f option ("suppress code slice extraction")
now imples the -i option ("suppress disk image build").

imp@ applied Patch by hand to new legacy.sh, plus tweaked for NANO_LOG vs
NANO_OBJ confusion in original.

PR:			186030
Reviewed by:		imp@
Differential Revision:	https://reviews.freebsd.org/D31102

(cherry picked from commit 587c054bea0f652fdbd86baf5807f21c904ac2ad)

Git Hash:   e1b5efda31c36df69af31e822c4967fba8ad2b50
Git Author: ardovm@yahoo.it
END