Fix internet() test function

The change in commit 6989713 broke the internet() test function by
trying to access the DNS port of "www.google.de", causing it to always
return False, which in turn broke all modules calling it. We instead use
the actual domain name of Google's DNS server at IP "8.8.8.8".
Merge pull request #118 from tomxtobin/fix-internet-util

Fix internet() test function