ftests: Remove unnecessary use of global in Log::log()

The global statement is only required when assigning to a global
variable, not when simply reading its value. In Log::log(), the
global log_level, global log_file and global log_fd declarations
are unnecessary because these variables are only read. Remove both
declarations from Log::log().

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>

Author: kamalesh-babulal

tests/ftests/log.py

@@ -18,8 +18,6 @@ class Log(object):
 
     @staticmethod
     def log(msg, msg_level=consts.DEFAULT_LOG_LEVEL):
-        global log_level, log_file, log_fd
-
         if log_level >= msg_level:
             if log_fd is None:
                 Log.open_logfd(log_file)