ethdev: deprecate legacy filter API

ethdev: deprecate legacy filter API

As stated in the deprecation notice from December 2016,
"the legacy filter API, including rte_eth_dev_filter_supported(),
rte_eth_dev_filter_ctrl() as well as filter types MACVLAN, ETHERTYPE,
FLEXIBLE, SYN, NTUPLE, TUNNEL, FDIR, HASH and L2_TUNNEL, is superseded
by the generic flow API (rte_flow)".

After a long wait of more than two years, the legacy filter API
is marked as deprecated, while still tested with testpmd and
the tep_termination example.

The next step will be to announce a deadline for complete removal.
As preparation of the removal of rte_eth_ctrl.h,
RTE_ETH_FLOW_*, RTE_TUNNEL_TYPE_* and RTE_ETH_HASH_FUNCTION_* definitions
are moved to rte_ethdev.h and rte_flow.h.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>