Add the ability to suppress mdns service scans for some services

[bdraco]

• When we are already running a ServiceBrowser for services that netdisco scans for we will already have all the answers we expect to get in the cache. By scanning for these services again, we generate additional network traffic. Since the known answer list was not shared between ServiceBrowsers in earlier versions of zeroconf, we will send an empty list which will cause every services we already have in the cache to be re-populated.

[bdraco]

netdisco/discoverables/apple_tv.py:        super(Discoverable, self).__init__(nd, '_appletv-v2._tcp.local.')
netdisco/discoverables/arduino.py:        super(Discoverable, self).__init__(nd, '_arduino._tcp.local.')
netdisco/discoverables/axis.py:        super(Discoverable, self).__init__(nd, '_axis-video._tcp.local.')
netdisco/discoverables/bluesound.py:        super(Discoverable, self).__init__(nd, '_musc._tcp.local.')
netdisco/discoverables/bose_soundtouch.py:        super(Discoverable, self).__init__(nd, '_soundtouch._tcp.local.')
netdisco/discoverables/digitalstrom.py:        super(Discoverable, self).__init__(nd, '_http._tcp.local.')
netdisco/discoverables/enigma2.py:        super(Discoverable, self).__init__(nd, '_e2stream._tcp.local.')
netdisco/discoverables/esphome.py:        super().__init__(nd, '_esphomelib._tcp.local.')
netdisco/discoverables/freebox.py:        super(Discoverable, self).__init__(nd, '_fbx-api._tcp.local.')
netdisco/discoverables/google_cast.py:        super(Discoverable, self).__init__(nd, '_googlecast._tcp.local.')
netdisco/discoverables/hass_ios.py:        super(Discoverable, self).__init__(nd, '_hass-ios._tcp.local.')
netdisco/discoverables/hass_mobile_app.py:        super(Discoverable, self).__init__(nd, '_hass-mobile-app._tcp.local.')
netdisco/discoverables/hikvision.py:        super(Discoverable, self).__init__(nd, '_http._tcp.local.')
netdisco/discoverables/home_assistant.py:        super(Discoverable, self).__init__(nd, '_home-assistant._tcp.local.')
netdisco/discoverables/homekit.py:        super(Discoverable, self).__init__(nd, '_hap._tcp.local.')
netdisco/discoverables/homekit.py:        name = name.replace('._hap._tcp.local.', '')
netdisco/discoverables/hp_printer.py:        super(Discoverable, self).__init__(nd, '_printer._tcp.local.')
netdisco/discoverables/kodi.py:        super(Discoverable, self).__init__(nd, '_http._tcp.local.')
netdisco/discoverables/lg_smart_device.py:        super(Discoverable, self).__init__(nd, '_lg-smart-device._tcp.local.')
netdisco/discoverables/lutron.py:        super(Discoverable, self).__init__(nd, '_lutron._tcp.local.')
netdisco/discoverables/nanoleaf_aurora.py:        super(Discoverable, self).__init__(nd, '_nanoleafapi._tcp.local.')
netdisco/discoverables/sabnzbd.py:        super(Discoverable, self).__init__(nd, '_http._tcp.local.')
netdisco/discoverables/spotify_connect.py:        super(Discoverable, self).__init__(nd, '_spotify-connect._tcp.local.')
netdisco/discoverables/tivo_dvr.py:        super(Discoverable, self).__init__(nd, '_tivo-remote._tcp.local.')
netdisco/discoverables/volumio.py:        super(Discoverable, self).__init__(nd, '_Volumio._tcp.local.')

All the types