RTE_FLOW_ACTION_TYPE_CONNTRACK handling was missing in a switch case
which filtered action types which have action query support in testpmd.
This prevented the conntrack query to succeed.

Fixes: 4d07cbefe3ba ("app/testpmd: add commands for conntrack")
Cc: bingz@nvidia.com
Cc: stable@dpdk.org

Signed-off-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
Acked-by: Bing Zhao <bingz@nvidia.com>
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