RANGER-3242 : Need feature to make the access log file name configurable for user

Issue:
Currently the access log file name is hard-coded from the server and is not configurable.

Changes:
Added customizable property ranger.accesslog.prefix to make the access log prefix name configurable with default name containing the hostname.

Testing:
Tested the changes locally, access log file is created using the default configured prefix.
1 file changed