rewrite threading code in jobwatchd

now it distributes the tasks properly among all threads,
and it can be used as a standalone program.
there are some minor performance issues which will be fixed shortly.

config.py

@@ -26,3 +26,7 @@ def load():
 	args = aparse.parse_args()
 
 	watchd_threads = args.watchd_threads
+
+	global servers
+	with open('servers.txt', 'r') as handle:
+		servers = handle.read().split('\n')