doc: announce ethdev API change for VF representors
doc: announce ethdev API change for VF representors

This is following the RFC being discussed and targets 18.05

http://dpdk.org/ml/archives/dev/2018-January/085716.html

Signed-off-by: Shahaf Shuler <59427d49da6f2b944fbf4cb5ee70ef3ac25f744f@mellanox.com>
Acked-by: Thomas Monjalon <5f50a84c1fa3bcff146405017f36aec1a10a9e38@monjalon.net>
Acked-by: Declan Doherty <b4388acd850cd8caad5000a112795063f04807ac@intel.com>
Acked-by: Remy Horton <34c343e92f0e27f7a8e26a1d8d2146ae7c7dd1a3@intel.com>
Acked-by: Luca Boccassi <678b97863301219a7659ccb717573825b33ce6a7@intl.att.com>
Acked-by: Alex Zelezniak <cc98ee003dd728c39bcb29e9ccfec52baf6bac19@att.com>
Acked-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk