BannedFilesTest: Detect "rootmydevice" vulnerability

See
http://www.theregister.co.uk/2016/05/09/allwinners_allloser_custom_kernel_has_a_nasty_root_backdoor/
for details.

Change-Id: Id9ba2fadb4b07b3171d24e8970b7bf4426c5cfb1
1 file changed