Create a 1.6.x backport branche for r1482759 and r1482779.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.6.x-r1482759@1483592 13f79535-47bb-0310-9956-ffa450edef68
Merge r1482759 and r1482779 from trunk onto the 1.6.x-r1482759 branch.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.6.x-r1482759@1483594 13f79535-47bb-0310-9956-ffa450edef68
Merge the 1.6.x-r1482759 branch:

 * r1482759, r1482779 
   Prevent svnserve from exiting when a client connection is aborted.
   Justification:
     DoS against svnserve possible.
   Branch:
     ^/subversion/branches/1.6.x-r1482759
   Votes:
     +1: breser, stsp, philip


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.6.x@1485045 13f79535-47bb-0310-9956-ffa450edef68