Build - edify: use set_metadata for backuptool

Also use saner permissions on backuptool.sh

Change-Id: If7b881807f8aa2ff2b1075e8d30cff9ea0bc39e3
Signed-off-by: STELIX <ssspinni@gmail.com>
Build - tools: getb64key - print the base64 version of a PEM public key file

Change-Id: I85478baa157c28b0cbb0cc90b53fe27604a29c51
Signed-off-by: STELIX <ssspinni@gmail.com>