Reduce DISTRO_FEATURES
Reduce DISTRO_FEATURES

Drop all "hardware" features from DISTRO_FEATURES (bluetooth, usb, etc),
and "desktop" (x11).  This should reduce the dependencies unnecessary
for typical docker use-cases substantially.

Also, set init_manager to something that is neither systemd nor
sysvinit, and tell update-rc.d.bbclass to leave our packages alone.
This should be sufficient to prevent postints attempting to
automatically start servers on package install.

anguslees/thinimg,anguslees/boxfactory