Added support for parsing and handling BGP Confederation related AS Path
attributes.
Note: BGP Confedertions are not supported (yet).

Also, updated/simplified the MED comparison in the BGP Path Comparison
implementation.

Change-Id: Iabe01facffd2c6912f33f647841c1244d85282f3
diff --git a/apps/sdnip/src/main/java/org/onlab/onos/sdnip/bgp/BgpSession.java b/apps/sdnip/src/main/java/org/onlab/onos/sdnip/bgp/BgpSession.java
index 98477ae..e0a710a 100644
--- a/apps/sdnip/src/main/java/org/onlab/onos/sdnip/bgp/BgpSession.java
+++ b/apps/sdnip/src/main/java/org/onlab/onos/sdnip/bgp/BgpSession.java
@@ -975,6 +975,10 @@
             case BgpConstants.Update.AsPath.AS_SET:
                 // FALLTHROUGH
             case BgpConstants.Update.AsPath.AS_SEQUENCE:
+                // FALLTHROUGH
+            case BgpConstants.Update.AsPath.AS_CONFED_SEQUENCE:
+                // FALLTHROUGH
+            case BgpConstants.Update.AsPath.AS_CONFED_SET:
                 break;
             default:
                 // ERROR: Invalid Path Segment Type