[collectd] Derive/Absolute datasource patch for 4.7.0

[Mariusz Gronczewski]

Hi,

i've updated my patch to 4.7.0, most of "data input" plugins (curl,
java, exec, perl, tail, couchdb) should work with derive. In case of
couchdb and curl, if u use absolute DS you can only "Set", no "Inc" or
"Add" coz obviously that wouldn't make much sense with it. Other
plugins can be "enabled" globally to use derive by changing "COUNTER"
to "DERIVE" in types.db but that way is ugly (but makes sense in some
cases, like when u have lot of tunnels or ppp interfaces) and either
needs converting or recreating rrd files.

Regards
Mariusz
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