Do not assume blank line between stanza in rc files

Hi Michael,

The pull request should fixed the issue mrash/fwknop#81. Please give it a try.


I have noticed the following command line produces two failed tests.

```
 ./test-fwknop.pl --loopback lo --enable-all --include "rc file default key, rc file named key"
```
but I am not sure to understand what is going on.