zopectl always exits with status 0

[Paul Winkler]

bin/zopectl always exits with status 0, even when something is obviously wrong. This makes it less useful for scripting tasks. Examples:

pw@kermit $ ./bin/zopectl run nosuchfile
Traceback (most recent call last):
  File "<string>", line 1, in ?
IOError: [Errno 2] No such file or directory: 'nosuchfile'
pw@kermit $ echo $?
0
pw@kermit $ ./bin/zopectl test -m error
(SNIP)
  Ran 2 tests with 1 failures and 1 errors in 0.031 seconds.
pw@kermit contentservices_dev $ echo $?
0

[Paul Winkler (slinkp)]

Fixed on trunk and the 2.11, 2.10, and 2.9 branches.
I updated doc/CHANGES.txt on the branches, but not the trunk.