Merge pull request #876 from irentu/master

[OPENENGSB-3696] GUI for user management doesn't work
[OPENENGSB-3704] Create initial connector bundle
[OPENENGSB-3705] Create LDAP-related utils and factory classes
[OPENENGSB-3706]  Unit tests for userprojects LDAP connector
[OPENENGSB-3703] Develop an LDAP connector for userprojects domain
[OPENENGSB-3707] userprojects LDAP connector should sync from LDAP
server to OpenEngSB
[OPENENGSB-3708] Integrate userprojects LDAP connector into the
framework
[OPENENGSB-3716] Problem with LdapDao