Move examples to examples dir, now LoadJsonFile() also returns err

* Move examples from cmd to examples dir
* Update Makefile
* LoadJsonFile() dies in-place on read or parse error which is not correct
* LoadJsonFile() wastes Instance map, now it returns its own map and error if any

example_data/01-config.json

@@ -0,0 +1,4 @@
+{
+	"loglevel": "info",
+	"logfile": "/var/log/messages"
+}