Recommended update for collectd

This recommended update for collectd fixes the following issues:

- Fix used memory overestimation by proper accounting SLAB (boo#987323)
- correct systemd service file to point to the correct configuration file (boo#987462)

Fixed bugs
bnc#987323
collectd: overestimates used memory
bnc#987462
collectd: collectd.conf is in wrong place
Selected Binaries
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