57866: Merged V4.2-BUG-FIX (4.2.1) to HEAD-BUG-FIX (Cloud/4.3)
57858: Merged V4.1-BUG-FIX (4.1.8) to V4.2-BUG-FIX (4.2.1)
57816: Merged DEV to V4.1-BUG-FIX (4.1.8)
57643: MNT-8989: MP4 and mov accessed over WebDav on safari or Chrome cause exceptions in log
Added ClientAbortException check.
Added unit tests.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@61899 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261