Feature/add who am i and you are services (#1024)

* Added Who-Am-I-Request encoding, decoding, unit tests, and command line application bacwhoami.

* Added You-Are-Request encoding, decoding, unit tests, and command line application bacyouare.

* Added Who-Am-I with Who-Is and You-Are handling into the example server application when run as device 4194303.

Makefile

@@ -238,6 +238,10 @@ mstpcrc:
 uevent:
 	$(MAKE) -s -C apps $@
 
+.PHONY: who-am-i
+who-am-i:
+	$(MAKE) -s -C apps $@
+
 .PHONY: whois
 whois:
 	$(MAKE) -s -C apps $@
@@ -250,6 +254,10 @@ writepropm:
 writegroup:
 	$(MAKE) -s -C apps $@
 
+.PHONY: you-are
+you-are:
+	$(MAKE) -s -C apps $@
+
 .PHONY: router
 router:
 	$(MAKE) -s -C apps $@