Comment 7 for bug 1511138

To work around this issue, I hosted a local image streams directory (e.g. cd vsphere; sudo python -m SimpleHTTPServer 80)
The directory structure is:
vsphere/
vsphere/server
vsphere/server/releases
vsphere/server/releases/trusty
vsphere/server/releases/trusty/release-20151103
vsphere/server/releases/trusty/release-20151103/test.ova
vsphere/streams
vsphere/streams/v1
vsphere/streams/v1/index.json
vsphere/streams/v1/com.ubuntu.cloud:released:download.json

test.ova was downloaded from the link in https://bugs.launchpad.net/cpc-core/+bug/1468383/comments/10
I'll attach index.json and com.ubuntu.cloud:released:download.json

Then add the following line to environment.yaml for the vsphere environment:
image-metadata-url: http://<IP or hostname of the http server>