Better error catching, again

Tried to run ccr-tools today, without any network connection at all:

```
$ ccr-tools -s -C devel ruby-bundler-1.0.21-1.src.tar.gz 
Your session has expired.
please enter your CCR password: 
grep: /tmp/ccr-tools-1000/ccrvote.login: No such file or directory
curl: (7) Failed to connect to 216.34.181.97: Network is unreachable
ruby-bundler-1.0.21-1: Successfully uploaded.
```

Uh huh, sure it was.
