distrib.c: Update copyright years

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
Add support for keepalive in SSA framework

and allow for configuration in core and distribution/access

Only enabled when configured for upstream side of rsocket AF_IB connection

Default for keepalive is currently 0 (disabled)

Signed-off-by: Hal Rosenstock <hal@mellanox.com>