Fix problem with ceph_key in python3
Fix problem with ceph_key in python3

Pretty basic problem of iteritems removal.

Signed-off-by: Jairo Llopis <da041d4dc0cbd1887011cdc12815601b7d2073cf@gmail.com>
(cherry picked from commit fc20973c2b9a89a15f8940cd100c34df4caca030)

fgal/ceph-ansible,fgal/ceph-ansible