Werk #5095: "Round trip average" graph: Added warn and crit lines

Component	Checks & agents
Title	"Round trip average" graph: Added warn and crit lines
Date	Aug 10, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.4.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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