Open 1.8.x backport branch for issue #4448

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x-issue4448@1540420 13f79535-47bb-0310-9956-ffa450edef68
Merged r1540044, r1540417 from trunk and resolved tree conflict
caused by refactoring on trunk.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x-issue4448@1540422 13f79535-47bb-0310-9956-ffa450edef68
Merge the r1537193 group from trunk:

 * r1537193, r1537221, r1540428
   Add test to verify if the used ZLib is affected by some block size bugs that
   affect our usage of serf.
   Justification:
     Most Windows binaries were affected by this bug and we should verify
     that we don't accidentally reintroduce this problem.
   Notes:
     This patch needs the source directory for obtaining its test data. The
     backport branch contains portions of r1537147 and r1537190 to enable
     this test.
   Branch: ^/subversion/branches/1.8.x-r1537193/
   Votes:
     +1: stefan2, rhuijben, ivan
     +1 (without r1540428): brane


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1541801 13f79535-47bb-0310-9956-ffa450edef68
Merge r1541432 from trunk:

 * r1541432
   Fix potential crash in mod_authz_svn during startup if path specified
   by AuthzSVNAccessFile, AuthzSVNReposRelativeAccessFile, or 
   AuthzSVNGroupsFile directives is not accessible.
   Justification:
     Crash on invalid configuration.
   Votes:
     +1: ivan, stefan2, rhuijben


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1541802 13f79535-47bb-0310-9956-ffa450edef68
Merge the 1.8.x-issue4448 branch:

 * r1540044, r1540417
   Fix issue 4448: hotcopy losing revprop files in packed repositories.
   Justification:
     Hot copies of packed svn 1.6/1.7 repos will not contain revision
     properties - rendering 'svnadmin hotcopy' useless as a means of backup.
   Branch: ^/subversion/branches/1.8.x-issue4448
   Votes:
     +1: stefan2, philip, rhuijben
     +0.5: ivan (Looks fine, but I don't have enough expertise in this area
                 for full review')


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1541803 13f79535-47bb-0310-9956-ffa450edef68