selftest: Move simple-dc-steps.sh to correct folder

This script helps re-create the environment for the dbcheck-oldrelease.sh links test.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

diff --git a/simple-dc-steps.sh b/source4/selftest/provisions/release-4-5-0-pre1/simple-dc-steps.sh
similarity index 100%
rename from simple-dc-steps.sh
rename to source4/selftest/provisions/release-4-5-0-pre1/simple-dc-steps.sh