[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