flow: add esp spi rss type

flow: add esp spi rss type

Type: feature

This patch adds IPsec ESP SPI as RSS key for better IPsec
inbound processing scaling. With this feature enabled,
The NIC will use the packets' SPI index as the RSS key
to distribute them to different queues.

The dpdk-input is also updated to support this feature.

Sample CLI command to enable Ipsec ESP SPI as RSS key:

test flow add src-ip any dst-ip any rss types esp
test flow enable eth0 index 0

Signed-off-by: Piotr Bronowski <piotrx.bronowski@intel.com>
Signed-off-by: Gabriel Oginski <gabrielx.oginski@intel.com>
Change-Id: I8b7d01cfc065e9099fad33042ce76898e16ddbf0