These are not meant to be complete shell scripts, so
shebang lines don't really make sense here. Rather, as
noted by the author (Daniel Friesen), scripts in the
parent directory include these files using the "source"
or "." command.
This reverts commit 96e0ed45a8.
Change-Id: I7a0b7bb2a5ea1b1c141cb36f38736fe562b22c10