svc/sdr.{ba,z}sh: clean up "sdr: " leftover
svc/squashdir-mount.initd: use stop_pre() instead of stuffing stop()
svc/zram.{conf,init}d: use start_pre() instead of stuffing start, and variable name clean up
svc/zramdir.initd: use start_pre() instead of stuffing start()
svc/README.textile: update/edit: +zramdir entry