Add some very basic safeguard against recursively deleting paths such
as / and /home in the event of bugs or user mistakes.
Addresses [YOCTO #7620].
(Bitbake rev: 56cddeb9e1e4d249f84ccd6ef65db245636e38ea)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>