Preliminary support for P4 switches

Change-Id: I2665813772bc5334eb171d9b304c3a80fff4d536
diff --git a/xos/synchronizer/models/fabric.xproto b/xos/synchronizer/models/fabric.xproto
index d717d94..d7023bd 100644
--- a/xos/synchronizer/models/fabric.xproto
+++ b/xos/synchronizer/models/fabric.xproto
@@ -40,6 +40,9 @@
         help_text = "Address where this switch can be managed",
         feedback_state = True,
         max_length = 1024];
+    optional string pipeconf = 9 [
+        help_text = "Pipeline configuration",
+        max_length = 1024];
 }
 
 message SwitchPort(XOSBase) {