Currently, there is no support for tracking tx_offload capabilities and
there is no separation between port capabilities and queue
capabilities. This is an issue if a test case requires a tx_offload
capability or if a test case requires that a card supports a capability
on a queue. This causes test cases with said requirements to not be
skipped when appropriate. Add tx_offload capabilities and distinguish
capabilities between ports and queues.

Signed-off-by: Andrew Bailey <abailey@iol.unh.edu>
Signed-off-by: Jeremy Spewock <jspewock@iol.unh.edu>

-        Args:
-            line: The line to parse.
+@dataclass
+class OffloadCapabilities(TextParser):
+    """The result of testpmd's ``show port <port_id> tx_offload capabilities`` command.