Add emulators/py-nova 14.0.2, Openstack Compute Service

Please note that this is a development version of nova.
Many features are not available.

Currently nova works on FreeBSD 11 and supports QEMU and Xen.

Common issues:

• Security groups are not implemented
• ARP spoofing, DHCP isolation protection are not implemented
• Nova services work from the root user
• No IPv6 support

QEMU issues:

• Need to enable serialconsole (TCP)
• Need to disable online CPU tracking
• Cannot mount cinder volumes

Xen issues:

• Live snapshots don't work
• No support for cinder volume hot-plugging
• XENBUS delay (5 min) when using qemu driver and COW images
• Some Linux images cannot be booted

For further FreeBSD specific notes please refer to port's pkg-message.

PR: 215151
Submitted by: Alexander Nusov (alexander.nusov@nfvexpress.com)