Doing "config" and "fetch" is quite inefficient for many plugins

I added configdirty support in munin-update with changeset r3355 and I also upgraded the df plugin to have a working example.

==Issues left:==

• munin-node is not updated yet. So a plugin has no way to know if the master has the capability or not. It's not really important, since the value is transparently conveyed and causes no warn or error on a vanilla 1.4 master.

The work on the munin-node is tracked in #859. Closing this one now.

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