Werk #5137: Fix error when spaces are present in custom agent files

Component	Agent bakery
Title	Fix error when spaces are present in custom agent files
Date	Sep 25, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Pro, Checkmk Ultimate MT

Resolves an error while baking agents when custom agent files that contain spaces exist.

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