xci: Update the repo directory structure

xci: Update the repo directory structure

This patch
- removes obsolete openstack-ansible and puppet-infracloud directories
- adds upstream directory to keep the contributions that are pending to
be accepted by upstream in order to have progress in OPNFV. In a perfect
world, one should expect to have nothing in this directory so the items
in this folder are short-lived.
- adds prototypes directory to keep stuff that hasn't been discussed to be
part of XCI and to share ideas and trials with the rest of the community.

Change-Id: I12afe7050ff2b0ac457d4b16d21dfd7df6ac84c9
Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>