Fix bug causing cvs2svn to claim "svnadmin load" failed even if it succeeded.
Also, show the exit status of failing commands.
* cvs2svn.py (DumpfileDelegate._add_or_change_path):
Display exit status of rcs co in error message.
(RepositoryDelegate.finish):
Display exit status of svnadmin load in error message.
Change success test to boolean truth, not identity with None -
thereby fixing the breakage of r1245.
git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@1248 be7e6eca-30d4-0310-a8e5-ac0d63af7087