CC-3224: "On-the-fly" stream rebroadcasting

- frond-end implementation for master dj and live dj
- db implementation
- liquidsoap is broken on this commit

python_apps/pypo/pypocli.py

@@ -153,11 +153,12 @@ if __name__ == '__main__':
     recorder.daemon = True
     recorder.start()
 
-    pmh.join()
-    pfile.join()
+    # all join() are commented out becase we want to exit entire pypo
+    # if pypofetch is exiting 
+    #pmh.join()
+    #recorder.join()
+    #pp.join()
     pf.join()
-    pp.join()
-    recorder.join()
     
     logger.info("pypo fetch exit")
     sys.exit()