Comment 13 for bug 1590633

During debugging, we are found, that not only GLARE affected here.
If we are change 'dummy_data' string with generated 'data' variable (put into image smth significant) in this line https://github.com/openstack/fuel-ostf/blob/master/fuel_health/glancemanager.py#L77 , we catch the same error.

Also, it looks like that only glance using PUT method in these tests. So, we are can't verify, that this is global problem.

Possible solution with HTTP_PROXY variable will not work (we are tried to verify it, but bvt was failed. Without HTTPS_PROXY it will not work).

I still think, that this happens due httpclose parameter in haproxy, but I've talked with Alex Shultz about it, and he voted against this change.

I can't find, what exactly component of the chain lead to this problem.