Python bindings use iteritems method which is not Python 3 compatible
In a number of places, the Ceph Python bindings use the
iteritems method, which in Python 3 gives errors like:
g1:/var/log/ceph # ceph balancer status Error EIO: Module 'balancer' has experienced an error and cannot handle commands: 'dict' object has no attribute 'iteritems'
In order to make the code compatible with Python 3, these instances of
iteritems need to be changed to
items, subject to the caveat that, in Python 2,
items does not produce an iterator. If the code demands an iterator, the iteritems function from six could be used since ceph-mgr already brings in six as a dependency (indirectly via bcrypt).
Backporting note: include https://github.com/ceph/ceph/commit/5f892430462 in the backport