LIBDIR was not defined, so the files ended up directly under /, not
good. Now they're properly installed under /usr/lib/ocf, as per
http://linux-ha.org/wiki/OCF_Resource_Agents

.

Also add "set -u" to prevent future occurrences of this kind of bug.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>