Fix data type of munin graphs.

Use GAUGE instead of DERIVE. See
http://guide.munin-monitoring.org/en/latest/architecture/syntax.html#datatypes
for details.

roles/munin-node/files/bbb.py

@@ -68,13 +68,13 @@ for m in meetings:
     p = m.getElementsByTagName("bbb-origin-server-name")[0]
     numMeetings += 1
     p = m.getElementsByTagName("participantCount")[0]
-    numAttendees += int(p.firstChild.wholeText) 
+    numAttendees += int(p.firstChild.wholeText)
     p = m.getElementsByTagName("listenerCount")[0]
-    numListeners += int(p.firstChild.wholeText) 
+    numListeners += int(p.firstChild.wholeText)
     p = m.getElementsByTagName("voiceParticipantCount")[0]
-    numWithVoice += int(p.firstChild.wholeText) 
+    numWithVoice += int(p.firstChild.wholeText)
     p = m.getElementsByTagName("videoCount")[0]
-    numWithVideo += int(p.firstChild.wholeText) 
+    numWithVideo += int(p.firstChild.wholeText)
 
 
 if "autoconf" in sys.argv:
@@ -86,22 +86,22 @@ elif "config" in sys.argv:
     print("graph_args --base 1000 -l 0")
     print("graph_category system")
     print("attendees.label attendees")
-    print("attendees.type DERIVE")
+    print("attendees.type GAUGE")
     print("attendees.info Number of attendees")
     print("attendees.draw AREA")
     print("meetings.label meetings")
-    print("meetings.type DERIVE")
+    print("meetings.type GAUGE")
     print("meetings.info Number of active conferences")
     print("video.label video")
-    print("video.type DERIVE")
+    print("video.type GAUGE")
     print("video.info Number of video streams")
     print("video.draw STACK")
     print("voice.label voice")
-    print("voice.type DERIVE")
+    print("voice.type GAUGE")
     print("voice.info Number of voice streams")
     print("voice.draw STACK")
     print("listeners.label listeners")
-    print("listeners.type DERIVE")
+    print("listeners.type GAUGE")
     print("listeners.info Number of listening attendees")
     print("listeners.draw STACK")
     sys.exit(0)