[task] prepared auth server for ldap authentication

- added spring security ldap dependency
- updated login template for login modus switch (normal, ldap)
- added test file for ledap server emulation
[task] added login filter for decision between internal and ldap
[task] made ldap configurable
[task] optimized java ldap configuration
[task] updated ldap user to scim user mapping
Merge pull request #174 from dacrome/ldap

[task] completed ldap integration in auth server