Use Chunked transfer encoding in the VMware store

Nova needs to upload streamOptimized disks to Glance. These
streamOptimized disks are converted/compressed on the fly by
vCenter. Consequently, it is not possible to know the size of
the Glance image before upload. Without specifying the size
or size zero, vCenter will reject the request (Broken Pipe).

This patch adds the Chunked transfer encoding which allows
to not specify a Content-Length header.

Change-Id: I579084460e7f61ab4042632d17ec0f045fa6f5af
Closes-Bug: #1313992
Merge "Use Chunked transfer encoding in the VMware store"