Werk #6841: Fixed missing hostname in graph collection graph titles

Component	Metrics system
Title	Fixed missing hostname in graph collection graph titles
Date	Oct 18, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Pro, Checkmk Ultimate MT 1.5.0p7 Checkmk Pro, Checkmk Ultimate MT

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