Since forever we've used sleep/wake as the way to implement
Networking Enabled.  When the state file was introduced to make the
networking and wifi states persistent, we ran into a bug where
a failed suspend (like if the machine ran out of power while
suspended) would result in networking being disabled on reboot
since suspend/resume used the same knob as enable/disable.

This patch adds a distinct call for enable/disable networking
which changes the state file, while sleep/wake no longer change
the state file.