Fix ... in to_ram_copy in live-init

The went to stderr and caused our error logging to report
them as an error.  Fixed with a redirect to stdout.
Don't mount devtmpfs in init=xxx mode in live-init

It seems to already be mounted and mountig it again
causes an error message.
Add noerr=xxx flag to live-init

Disables both fatal and non-fatal error that match xxx at the
start.  Use _ for space.  Case counts.
Move read_xlat out of main_core() in live_init

When we capture stderr, it causes main_core() to run in
a subprocess so variables set in main_core() don't make it
out of main_core().  This means both read_xlat and set_colors
must be called before we run main_core().