Add py-nose and py-unittest2 Makefile snippets

Also, shuffle around code to appropriate spots for
bsd.test.mk and atf.test.mk

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Merge branch 'master' into atf-tools-regression-convert

Conflicts:
	share/mk/Makefile
	share/mk/atf.test.mk
Link some more geom test bits into the build..

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>