Add usage for '-f <file>'.
HIVE-4364: beeline always exits with 0 status, should exit with non-zero status on error (Rob Weltman via Ashutosh Chauhan and Julian Hyde)
HIVE-4566: NullPointerException if typeinfo and nativesql commands are executed at beeline before a DB connection is established (Xuefu Zhang via Ashutosh Chauhan and Julian Hyde)