Revert "EdgeOS: /config is not user-writeable, sync to /tmp and then sudo move from there"

This reverts commit f12a1b5b9f014754547d39f1d72f25dec2e2f74e.
Revert "EdgeOS: config.boot is in /config"

This reverts commit 94b9ffb712609d17cb9b0e2d9a71cea90ca4661e.
EdgeOS: check if running on UBNT device and set CONFIG_BOOT_FILE accordingly.

EdgeOS has config.boot in /config, so we detect this and update the
CONFIG_BOOT_FILE variable.
initial debianization based on vyatta-dummy
install vyatta-config-sync to /usr/sbin
bump version
remove unneeded substvars
add example config files
add 'config-sync' and 'config-sync noload' opmode commands
add opmode commands