Turris OS 4.0.5 release

* Based on the latest OpenWrt 18.06.6
* kernel: update to version 4.14.162
* python3: update to version 3.6.10
* wget: fix CVE-2019-5953
* unbound: update to version 1.9.6
* php7: update to version 7.2.26
  Fixes: CVE-2019-11044, CVE-2019-11045, CVE-2019-11046, CVE-2019-11047, CVE-2019-11050
* nano: update to version 4.7
* openssl: update to version 1.0.2u
* bird: update to version 1.6.8
* reforis: update to the latest development version, adds openvpn-plugin
* ffmpeg: update to version 4.0.5
  Fixes: CVE-2019-12730, CVE-2019-17539, CVE-2019-17542
* e2fsprogs: fix CVE-2019-5094
* christmas: removed from default installation