Turris OS 4.0.2 release

* Based on the latest OpenWrt 18.06.5
* added missing hardening package list
* fixed autodetection of router address in Foris OpenVPN
* irssi: updated to version 1.2.2, fix CVE-2019-15717
* sudo: updated to version 1.8.28p1, fix CVE-2019-14287
* bind: updated to version 9.11.13, fix CVE-2019-6477
* openldap: updated to version 2.4.48, fix CVE-2019-13565
* kernel: updated to version 4.14.156
* libpcap: updated to version 1.9.1, fix CVE-2019-1516{1,2,3,4,5}
* tcpdump: updated to version 4.9.3, fix multiple CVEs
* python: updated to version 2.7.17
* php7: updated to version 7.2.25, fix CVE-2019-11043, CVE-2019-11042
* mariadb: updated to version 10.4.10, fix CVE-2019-2974, CVE-2019-2938
* foris: updated to version 100.6
* foris-controller: updated to version 1.0.6
* python[3]-cryptography: fix CVE-2018-10903
* ustream-ssl: CVE-2019-5101, CVE-2019-5102
* unbound: updated to version 1.9.5, fix CVE-2019-18934
* haproxy: updated to version 1.8.23, fix CVE-2019-19330
* lxc: fix CVE-2019-5736
* tor: updated to version 4.1.6
* nano: updated to version 4.6
* libiconv: updated to version 1.16
* enable RTC NVMEM access for Turris 1.x
* luci-compat, lmdb: new packages