pyloxi: support OXM member in set-field actions
The C backend needs more work to support of_oxm_t, so I've added a hack so it
can keep using of_octets_t.
Also added several set-field action testcases.
diff --git a/test_data/of13/action_set_field_tcp_src.data b/test_data/of13/action_set_field_tcp_src.data
new file mode 100644
index 0000000..a69c7c0
--- /dev/null
+++ b/test_data/of13/action_set_field_tcp_src.data
@@ -0,0 +1,8 @@
+-- binary
+00 19 # type
+00 10 # length
+80 00 1a 02 # OXM header
+00 32 # OXM value
+00 00 00 00 00 00 # pad
+-- python
+ofp.action.set_field(field=ofp.oxm.tcp_src(50))