Werk #3401: Fix sorting and grouping hosts by their IPv4 address

Component	User interface
Title	Fix sorting and grouping hosts by their IPv4 address
Date	Apr 19, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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