Merge pull request #722 from ddurnev/master

[RJA-1516][feature]: use typesafe config library for reading settings defaults
[RJA-xxx][fix] 6k header is not enough for authorization negotiate with kerb tokens
Merge pull request #726 from bugzmanov/master

[RJA-xxx][fix] 6k header is not enough
[RJA-1530][fix]: don't treat comma as list separator in string values of system/plugins settings