Werk #3586: Fixed file locking issues (rare and random errors that settings file could not be loaded)

Component	User interface
Title	Fixed file locking issues (rare and random errors that settings file could not be loaded)
Date	Jun 2, 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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