Added reno for the following features:
* VDI stream
* XAPI pool
And also updated README to include the feature information.
Change-Id: I3ff557294d7b1249b832db94a7dc3d4388e48684
https://wiki.openstack.org/wiki/LegalIssuesFAQ said about copyrights,
this patch is to change the new added files' copyrights from
'OpenStack Foundation' to 'Citrix Systems'
Change-Id: Iec9dab76bf9906d865c54c3c9a2df0eb1fb73761
Jianghua Wang