Fix diskusage beacon

The examples given in the config did not match the code.

Adjusted code to line up with examples.

salt/beacons/diskusage.py

@@ -61,9 +61,9 @@ def beacon(config):
             - /: 63%
             - /mnt/nfs: 50%
     '''
+    print(config)
     ret = []
-    for diskusage in config:
-        mount = diskusage.keys()[0]
+    for mount in config:
 
         try:
             _current_usage = psutil.disk_usage(mount)
@@ -73,7 +73,7 @@ def beacon(config):
             continue
 
         current_usage = _current_usage.percent
-        monitor_usage = diskusage[mount]
+        monitor_usage = config[mount]
         if '%' in monitor_usage:
             monitor_usage = re.sub('%', '', monitor_usage)
         monitor_usage = float(monitor_usage)