CORD-349 Support VLAN cross-connect traffic

Change related to this topic:
- Support VLAN cross-connect traffic
    Utilize ports subjectClass to achieve. For non-xConnect port, set interface VLAN to -1
- Remove VLAN checking since we have multiple VLANs per port
- Hash the L2 interface group key generation to include VLAN as well
- Update the network-cfg.json sample

Other refactoring changes:
- Read next objective stores from srManager directly
- Use constant for flow priority
- CORD-267 Javadoc fix

Change-Id: I4ca8c2d9c8b3633a4a0101c5070d19343f7e5b90
diff --git a/tools/package/config/samples/network-cfg-fabric2x2-xconnect.json b/tools/package/config/samples/network-cfg-fabric2x2-xconnect.json
new file mode 100644
index 0000000..ef73261
--- /dev/null
+++ b/tools/package/config/samples/network-cfg-fabric2x2-xconnect.json
@@ -0,0 +1,114 @@
+{
+    "ports" : {
+    "of:0000000000000001/3" : {
+        "interfaces" : [
+        {
+            "ips" : [ "10.0.1.254/24" ],
+            "vlan" : "-1"
+        },
+        {
+            "vlan" : "100"
+        }
+        ]
+    },
+    "of:0000000000000001/4" : {
+        "interfaces" : [
+        {
+            "ips" : [ "10.0.1.254/24" ],
+            "vlan" : "-1"
+        }
+        ]
+    },
+    "of:0000000000000001/5" : {
+        "interfaces" : [
+            {
+                "vlan" : "100"
+            }
+        ]
+    },
+    "of:0000000000000002/3" : {
+        "interfaces" : [
+        {
+            "ips" : [ "10.0.2.254/24" ],
+            "vlan" : "-1"
+        }
+        ]
+    },
+    "of:0000000000000002/4" : {
+        "interfaces" : [
+        {
+            "ips" : [ "10.0.2.254/24" ],
+            "vlan" : "-1"
+        }
+        ]
+    }
+    },
+    "devices" : {
+        "of:0000000000000001" : {
+            "segmentrouting" : {
+                "name" : "Leaf-R1",
+                "nodeSid" : 101,
+                "routerIp" : "10.0.1.254",
+                "routerMac" : "00:00:00:00:01:80",
+                "isEdgeRouter" : true,
+                "adjacencySids" : []
+            }
+        },
+        "of:0000000000000002" : {
+            "segmentrouting" : {
+                "name" : "Leaf-R2",
+                "nodeSid" : 102,
+                "routerIp" : "10.0.2.254",
+                "routerMac" : "00:00:00:00:02:80",
+                "isEdgeRouter" : true,
+                "adjacencySids" : []
+            }
+        },
+        "of:0000000000000191" : {
+            "segmentrouting" : {
+                "name" : "Spine-R1",
+                "nodeSid" : 103,
+                "routerIp" : "192.168.0.11",
+                "routerMac" : "00:00:01:00:11:80",
+                "isEdgeRouter" : false,
+                "adjacencySids" : []
+            }
+        },
+        "of:0000000000000192" : {
+            "segmentrouting" : {
+                "name" : "Spine-R2",
+                "nodeSid" : 104,
+                "routerIp" : "192.168.0.22",
+                "routerMac" : "00:00:01:00:22:80",
+                "isEdgeRouter" : false,
+                "adjacencySids" : []
+            }
+        }
+    },
+    "hosts" : {
+        "00:00:00:00:00:01/4093" : {
+            "basic": {
+                "ips": ["10.0.1.1"],
+                "location": "of:0000000000000001/3"
+            }
+        },
+        "00:00:00:00:00:02/4093" : {
+            "basic": {
+                "ips": ["10.0.1.2"],
+                "location": "of:0000000000000001/4"
+            }
+        },
+        "00:00:00:00:00:03/4093" : {
+            "basic": {
+                "ips": ["10.0.2.1"],
+                "location": "of:0000000000000002/3"
+            }
+        },
+        "00:00:00:00:00:04/4093" : {
+            "basic": {
+                "ips": ["10.0.2.2"],
+                "location": "of:0000000000000002/4"
+            }
+        }
+    }
+}