MFC r293621,r293622,r293815:

MFC r293621,r293622,r293815:

r293621:

- Delete non-TAP testcases
- Add a conf.sh file for executing common functions with geom_gate
- Use attach_md for attaching md(4) devices
- Don't hardcode /tmp for temporary files, which violates the kyua sandbox
- Add/increase sleeps to try and improve synchronization
- Add debug output for when checksums fail

test-1.t:
- Use pkill for killing ggated

r293622:

Remove Makefile now that the testcases are all TAP based and
prove -rv can be used on them

r293815:

Add conf.sh file missed in r293621

git-svn-id: svn://svn.freebsd.org/base/stable/10@296814 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f