[CORD-544] Adds VPWS extensions in Loxi

Changes:
- Adds VPWS actions in Loxi;
- Adds VPWS OXMs in Loxi;
- Improves .gitignore;

Change-Id: I266702148bbed99cc8c91e2cb00b0b556018814e
diff --git a/openflow_input/ofdpa b/openflow_input/ofdpa
index 47aa11e..c11aa89 100644
--- a/openflow_input/ofdpa
+++ b/openflow_input/ofdpa
@@ -1,7 +1,14 @@
 #version 4
 
-struct of_oxm_ofdpa_mpls_type : of_oxm {
-    uint32_t type_len == 0xFFFF2E06;
-    uint32_t experimenter_id == 0x1018;
-    uint16_t value;
+// Here we define the general structures for the OFDPA extensions
+
+// This structure represents an ofdpa experimental action
+// See ofdpa_actions for further specifications
+struct of_action_ofdpa : of_action_experimenter {
+    uint16_t type == 65535;
+    uint16_t len;
+    uint32_t experimenter == 0x1018;
+    uint16_t exp_type == ?;
+    pad(6);
 };
+