Merge pull request #717 from azhuchkov/ldap-tests

[RJA-XXX][fix] Fixed users/groups autocomplete
[RJA-1514][feature] - Remove deprecated api.RequestResult
Merge pull request #721 from rsvato/master

[RJA-1514][feature] - Remove deprecated api.RequestResult
[RJA-XXX][feature] Implemented new method for getting bunch of users to optimize storage usage;
[RJA-XXX] Exclude all caching stuff from ldap
[RJA-XXX] Prefix search for users and groups; Ldap service logging;
[RJA-XXX][feature] Introduced timeout and size limit parameters for LDAP module
[RJA-XXX][fix] Fixed autocomplete minimal input size
[RJA-XXX][feature] Removed fallback for invalid users/groups services