Clean up property service initialization.

All the code that was being delayed does is create a socket. We can
do that straight away, avoid the overhead, and simplify our main loop.

The keychord fd, on the other hand, seems a little tricky. It looks
like /dev/keychord isn't immediately available, at least not on N9;
we have to wait for ueventd to set us up the bomb.

Change-Id: I020e75b8e4b233497707f0a3cbbb6038b714161f