[yocto] Development and production images

[Mircea Gliga]

In my layer I've defined a separate image for development and a separate 
one for production, eg myimage-dbg.bb and myimage.bb
The difference between them is that the devel one has extra packages 
installed.
So, if you want to build a development image you build the `myimage-dbg` 
image, else the other one.
Now, for production images, I want to disable the serial console login, 
this is controlled by the SERIAL_CONSOLES variable and is specified in 
the machine.conf file, so this cannot be added to the image recipes.
In order to keep things as simple as I can, and make the choice only 
once (devel vs production), I want to avoid creating separate 
machine.conf files for development and production, eg mymachine.conf and 
mymachine-dbg.conf.


Do you have any suggestion on what's the best and approach ?

Thanks