crush-reweight-by-utilization.py after upgrade to Nautilus

[vaclove]

Hi,

thank you for creating such a great collection of scripts. After upgrade my Ceph cluster to Nautilus the crush-reweight-by-utilization.py script stopped working.

# python crush-reweight-by-utilization.py --verbose --max-change=0.05 
Traceback (most recent call last):
  File "crush-reweight-by-utilization.py", line 211, in <module>
    if VERBOSE: raise(e)
KeyError: 'osd_stats'

[vaclove]

If anyone else experiences the same problem, I have found the solution. If you replace:

pgm = cephinfo.pg_data

on line 42 with this:

pgm = cephinfo.pg_data['pg_map']

It starts working. I did not check others scripts, so the solution may be similar (perhaps change in cephinfo library would be better?).