Fix "./docker" package name on freebsd

This fixes "can't load package: package ./docker: found packages client.go (main) and daemon_freebsd.go (docker)"

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>

docker/daemon_freebsd.go

@@ -1,6 +1,6 @@
 // +build daemon
 
-package docker
+package main
 
 // notifySystem sends a message to the host when the server is ready to be used
 func notifySystem() {