Correctly distinguish between Dell and Juniper devices

Unfortunately there's not much info we can get from the Dell iDrac
HTML page as it's ridden with JavaScript.
No need to add the server family explicitly
Add an option to ignore network's addresses
Merge pull request #342 from deejay1/varia

Correctly distinguish between Dell and Juniper devices
Merge pull request #383 from deshipu/master

Blacklistowanie networków jako nieunikalnych 
Merge remote-tracking branch 'allegro/master' into deployment