Werk #2145: LDAP-Sync: Handling user ids with special characters more user friendly

At the moment the Check_MK GUI does not allow to use special characters like german umlauts in the user ID. By default the LDAP sync pluginn tries to replace these umlauts with some similar characters, or if enabled, it tries to skip these users during sync.

But if a user ID contains other special characters, which are not handled by the LDAP code, this could result in exceptions after synchronising such users.

We improved the handling of those users to skip them silently during synchronisation. If you miss some users, just enable the diagnostic log and have a look at the LDAP debug log (located in var/check_mk/web/ldap-debug.log in OMD sites) and search for Skipped user: ... entries. If you need these users within Check_MK please let us know, we will add the needed umlauts to the translation map.

For future innovation releases we plan to make such special characters usable in user IDs, then this translation map will not be needed anymore.

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