Add the sbins to PATH

On fedora (and possibly other systems) sshd is compiled with
--with-default-path=/usr/local/bin:/usr/bin
for non interactive shells because /etc/profile isn't read this
results in PATH not including sbin.

For simplicity I append sbin to the current PATH regardless if it
already exists or not.

Change-Id: I5f6aecb2b1fa9c49f4d15c5d96c005607b05c803
Merge "Add the sbins to PATH"