script: auto-generate bash_completion_dog

The current bash_completion_dog is too out-of-date.  Rather than
updating the file, this patch adds a perl script to auto-generate the
file from dog help information like man/collie.8.

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Signed-off-by: Liu Yuan <namei.unix@gmail.com>
Makefile: remove zk_control from install programs

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Signed-off-by: Liu Yuan <namei.unix@gmail.com>