stashing the uci status on first-boot for later comparison

Signed-off-by: Russell Senior <russell@personaltelco.net>
modify since-last-flash.sh to accomodate the uci-defaults transition

Signed-off-by: Russell Senior <russell@personaltelco.net>
add back root/.ssh/known_hosts with just iris

Signed-off-by: Russell Senior <russell@personaltelco.net>