In the test suite, make sure that the --http-library argument affects the svnsync tests too.
In the test suite, make sure that the --http-library argument affects
the svnsync tests too.

* subversion/tests/cmdline/svntest/main.py
  (_with_config_dir): Extract a function from run_svn which adds
   --config-dir to the command line if it's not there already.
  (run_svn, run_svnsync): Use _with_config_dir on argument list.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@865606 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion