selftests: openvswitch: Refactor actions parsing.

Until recently, the ovs-dpctl utility was used with a limited actions set
and didn't need to have support for multiple similar actions.  However,
when adding support for tunnels, it will be important to support multiple
set() actions in a single flow.  When printing these actions, the existing
code will be unable to print all of the sets - it will only print the
first.

Refactor this code to be easier to read and support multiple actions of the
same type in an action list.

Reviewed-by: Simon Horman <[email protected]>
Tested-by: Simon Horman <[email protected]>
Signed-off-by: Aaron Conole <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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