Remove Home Assistant together with dependencies

All the packages, which I removed are included in OpenWrt master, these days except one, which is Home Assistant. This one is not currently working in OpenWrt 18.06. So, let's remove it in favor of the upcoming OpenWrt release, where I would like to have HA. If any case, I can backport it to OpenWrt 18.06, but I will do it as patches for turris-build. There's no need to have it in Turris OS packages.

• zeroconf, netdisco - https://github.com/openwrt/packages/pull/8749
• astral - https://github.com/openwrt/packages/pull/8478
• netifaces - https://github.com/openwrt/packages/pull/8741
• Home Assistant - https://github.com/openwrt/packages/pull/8750 - PENDING

pyyaml, this one is in OpenWrt as pyaml, which doesn't seem like correct name, but they have it for it there long time. Let's dont break more things. ;-)