Werk #5470: Make the number of rrdcached write threads configurable.

Component	Setup
Title	Make the number of rrdcached write threads configurable.
Date	Dec 11, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i2 Checkmk Pro, Checkmk Ultimate MT

Thanks to Matthias Hähnel for this patch!

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