Add VPP composable service

Add VPP composable service

Vector Packet Processing (VPP) is a high performance packet processing
stack that runs in user space in Linux. VPP is used as an alternative to
kernel networking stack for accelerated network data path. This patch
adds VPP as a composable service. Note that NIC binding related configs
for VPP are handled in os-net-config.

Depends-on: I70a68a204a8b9d533fc2fa4fc33c39c3b1c366bf

Change-Id: I5e4b1903dc87cb16259eeb05db585678acadbc6b
Implements: blueprint fdio-integration-tripleo