--hosts-file-enabled help misleading or default state incorrect

[m-bruck]

With --help the following description is printed:

--hosts-file-enabled
       If specified, use hosts files for resolving.

1. The hosts files are used whether this is specified or not, since in config.go it defaults to true.

2. The syntax to disable the feature is not clear from the help (i.e. --hosts-file-enabled=false)