Author: Ruslan Kabalin
MDL-50907 antivirus: Implement data stream scanning default process.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bd74bda383a0a6a71c8987b8274016220a1c2531
http://github.com/moodle/moodle/commit/bd74bda383a0a6a71c8987b8274016220a1c2531
+ 3.5 en [datastream,core_antivirus]