[OPENENGSB-3767] Add private constructor to ModelAsserts utility class
[OPENENGSB-3768] Add license headers to userync code
[OPENENGSB-3768] Add license headers to usersync .rules files
[OPENENGSB-3769] Remove entryStructureDefinition file extension
[OPENENGSB-3770] ldif heading whitepsace fixes
Merge pull request #900 from thrau/master

Checkstyle fixes and license headers related to ldap usersync code
Merge pull request #898 from stfnsche/master

[OPENENGSB-3761] handle null values correctly
[OPENENGSB-3774] Fix checkstyle errors in RequestHandlerImpl and Test code
[OPENENGSB-3775] Fix checkstyle errors in LogService
Merge pull request #901 from thrau/master

[OPENENGSB-3774] Fix checkstyle errors in RequestHandlerImpl and Test
[OPENENGSB-3739] fix travis build