[in tools/server-side/svnpubsub]

Prepare to wrap subprocess.check_call().  No functional change.

* svnwcsub.py
  (check_call): New file-scope wrapper.
  (*): Use it instead of subprocess.check_call.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1432789 13f79535-47bb-0310-9956-ffa450edef68