Merge pull request #716 from ddurnev/master

[RJA-1476][feature]: Validation on start 
[RJA-XXX][fix] Fixed users/groups autocomplete
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-1516][feature]: use typesafe config library for reading settings defaults