This patch is to make two updates with XenServer/XAPI based
Xen Variants in file hypervisor-xen-api.rst:
1. XenAPI driver has supported neutron network, but current
document is still using nova-network, change the manual
to use neutron network and update the graph
2. Both nova and neutron projects changed to use os-xenapi,
change the *installing plug-ins* section from nova repo to
os-xenapi
Change-Id: I194fb6edf270b672d278452851bdc3205d63a674
04133ee00f
