Suppress sandbox creation for tests that are going to be skipped.
Suppress sandbox creation for tests that are going to be skipped.

* subversion/tests/cmdline/svntest/testcase.py (Skip.need_sandbox): If
  self.cond is true, then return false instead of delegating to
  self.test_case.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859475 13f79535-47bb-0310-9956-ffa450edef68

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