Create custom reach distro

To start out with we disable a few features that were enabled by default in the
poky distro:

asla
bluetooth
irda
pcmcia
nfs
zeroconf
pci
3g
pam
opengl

Signed-off-by: Steve Sakoman <steve@sakoman.com>
local.conf.sample: change DISTRO from poky to reach

Signed-off-by: Steve Sakoman <steve@sakoman.com>