Added advanced Heavy Hitter Detection example (#136)

* Added advanced Heavy Hitter Detection example

* Changed directory location

* Restored skeleton version

* Added files for common run infra with the other tutorials

* Updated readme

* Autogenerate setup rules

* Commends in simple_router.p4

* Fix typos

* Removed commended out lines

Teaching/Stanford_CS344_2018/parser.p4

@@ -0,0 +1,51 @@
+parser ParserImpl(packet_in packet, out headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) {
+    state start {
+        transition parse_ethernet;
+    }
+
+    state parse_ethernet {
+        packet.extract(hdr.ethernet);
+        transition select(hdr.ethernet.etherType) {
+            16w0x800: parse_ipv4;
+            default: accept;
+        }
+    }
+
+    state parse_ipv4 {
+        packet.extract(hdr.ipv4);
+        transition select(hdr.ipv4.protocol) {
+            8w0x6: parse_tcp;
+            default: accept;
+        }
+    }
+
+    state parse_tcp {
+        packet.extract(hdr.tcp);
+        transition accept;
+    }
+}
+
+control DeparserImpl(packet_out packet, in headers hdr) {
+    apply {
+        packet.emit(hdr.ethernet);
+        packet.emit(hdr.ipv4);
+        packet.emit(hdr.tcp);
+    }
+}
+
+control verifyChecksum(inout headers hdr, inout metadata meta) {
+    apply { }
+}
+
+control computeChecksum(inout headers hdr, inout metadata meta) {
+    apply {
+        update_checksum(
+                hdr.ipv4.isValid(),
+                { hdr.ipv4.version, hdr.ipv4.ihl, hdr.ipv4.diffserv,
+                hdr.ipv4.totalLen, hdr.ipv4.identification,
+                hdr.ipv4.flags, hdr.ipv4.fragOffset, hdr.ipv4.ttl,
+                hdr.ipv4.protocol, hdr.ipv4.srcAddr, hdr.ipv4.dstAddr },
+                hdr.ipv4.hdrChecksum,
+                HashAlgorithm.csum16);
+    }
+}