app/testpmd: support shared flow action

app/testpmd: support shared flow action

This patch adds shared action support to testpmd CLI.

All shared actions created via testpmd CLI assigned ID for further
reference in other CLI commands. Shared action ID supplied as CLI
argument or assigned by testpmd is similar to flow ID & limited to
scope of testpdm CLI.

Create shared action syntax:
flow shared_action {port_id} create [action_id {shared_action_id}]
	[ingress] [egress] action {action} / end

Create shared action examples:
	flow shared_action 0 create action_id 100 \
		ingress action rss queues 1 2 end / end
	This creates shared rss action with id 100 on port 0.

	flow shared_action 0 create action_id \
		ingress action rss queues 0 1 end / end
	This creates shared rss action with id assigned by testpmd
	on port 0.

Update shared action syntax:
flow shared_action {port_id} update {shared_action_id}
	action {action} / end

Update shared action example:
	flow shared_action 0 update 100 \
		action rss queues 0 3 end / end
	This updates shared rss action having id 100 on port 0
	with rss to queues 0 3 (in create example rss queues were
	1 & 2).

Destroy shared action syntax:
flow shared_action {port_id} destroy action_id {shared_action_id} [...]

Destroy shared action example:
	flow shared_action 0 destroy action_id 100 action_id 101
	This destroys shared actions having id 100 & 101

Query shared action syntax:
flow shared_action {port} query {shared_action_id}

Query shared action example:
	flow shared_action 0 query 100
	This queries shared actions having id 100

Use shared action as flow action syntax:
flow create {port_id} ... / end actions [action / [...]]
	shared {action_id} / [action / [...]] end

Use shared action as flow action example:
	flow create 0 ingress pattern ... / end \
		actions shared 100 / end
	This creates flow rule where rss action is shared rss action
	having id 100.

All shared action CLIs report status of the command.
Shared action query CLI output depends on action type.

Signed-off-by: Andrey Vesnovaty <andreyv@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>