ceph.in: rip out reusable code to pybind/ceph_argparse.py

Signed-off-by: Dan Mick <dan.mick@inktank.com>

Conflicts:
	src/ceph.in
Add header comments and Inktank copyrights to ceph.in/ceph_argparse.py

Signed-off-by: Dan Mick <dan.mick@inktank.com>