Return the command as a string, rather than as a list, from open_pipe().
Return the command as a string, rather than as a list, from open_pipe().

The COMMAND value returned from open_pipe() as part of the WAITER
return value is only used to generate error messages, so return it as
a string rather than as a list of strings.  Change wait_on_pipe()
accordingly.

* subversion/tests/cmdline/svntest/main.py

  (open_pipe): Return the command as a string rather than as a list of
  strings.  Rename local variable command_list -> command_string to
  reflect its new type.

  (wait_on_pipe): Expect a string rather than a list of strings as the
  second element of the WAITER argument.  Rename local variable
  command -> command_string to make its type more obvious.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@878691 13f79535-47bb-0310-9956-ffa450edef68

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