pbr: update to 1.1.7-47

pbr: update to 1.1.7-47

* bump compat version to accommodate new strings
* update dnsmasq-related code to better support separate confdirs
  for separate instances
* remove procd_lan_interface as it didn't reflect that it's a list of devices
* introduce procd_lan_device list
* improve the output() function (thanks @bigsmile74)
* remove duplicate uci_get_device
* improve ipv6 detection and interface setup
* improve dhcp force detection for interfaces name differently from lan
* fix array/element parameters for some json operations
* remove unneeded null redirects for `try` calls
* remove (iptables-only) capitalized chain names form validation
* working pbr-netifd flavor

Signed-off-by: Stan Grishin <stangri@melmac.ca>