-add explanation of daemon authentication to AuthJSONRPCServer docstring
-remove auth_required decorator, use auth for all api methods if use_authentication is true
-fix issues with the command line --http-auth flag to lbrynet-daemon and the use_http_auth setting in the config file
The config file might be stores in an alternate location for several
reasons (i.e. testing different configs or running multiple nodes on the
same host). Make the config file a CLI parameter so that it can be
specified when launching the lbrynet-daemon.
Related to #1039
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>