fix util-host-os-info unit tests - v1

[jasonish]

• Some tests always passed due to the result value being
  initialized to 1.
• Fix tests that now fail. Looks like just the test were wrong
  and that the code does the right thing.

Buildbot output:

• PR jasonish-pcap: https://buildbot.openinfosecfoundation.org/builders/jasonish-pcap/builds/71
• PR jasonish: https://buildbot.openinfosecfoundation.org/builders/jasonish/builds/72

[jasonish]

Note that the Travis error is:
12.85s
$ ./qa/travis-libhtp.sh
+git clone https://github.com/ironbee/libhtp -b 0.5.x
Cloning into 'libhtp'...
fatal: unable to access 'https://github.com/ironbee/libhtp/': gnutls_handshake() failed: A TLS packet with unexpected length was received.

[inliniac]

I restarted the travis build and it's green now.