Comment 5 for bug 1635241

Unfortunately, there is no simple solution for this fix.
The proper one is not use glance v1 api because it interprets all metadata as headers. In glance v2 this gap was fixed and header body was sent as response body. So long term solution is move ceilometer to v2 (nova already moved to v2 in Newton).
I am trying to figure out if we can somehow escape there characters because we can't prohibit creation of this metadata(this breaks backward compatibility).