ip: add barrier sync, ip4_ply_pool expand case
ip: add barrier sync, ip4_ply_pool expand case

ply_create() is not thread safe when the ip4_ply_pool expands.

Type: fix
Signed-off-by: Vladislav Grishenko <f00e66fbbe96bb8dd2df4e1fa4eb52430c5b92c3@yandex-team.ru>
Change-Id: Ie11cc8b1ba587d5e9239a60f4e288492da61368e

FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp