Add LOG.warning to Disallowed minor changes
Add LOG.warning to Disallowed minor changes

Adds move to LOG.warning to disallowed minor changes page with
explanation.

Change-Id: Ib4ac1175005c8f41e65b56770e14d1a7817df7f0

openstack/glance,stevelle/glance,openstack/glance,rajalokan/glance,stevelle/glance,rajalokan/glance,openstack/glance