pbr: update to 1.2.1-r35

pbr: update to 1.2.1-r35

pbr 1.2.1-r35

Makefile:
* split uci-defaults into different purpose files
* add handling of netifd integration

Config:
* update with default values for all options (thanks @betonmischer86)

Init-script:
* add netifd integration handling
* add ip() function to emulate ip rule replace
* add netbird intrfaces support (thanks @egc112)
* reorganize loading/handling of options in load_package_config()
* improve display of interface triggers in service_triggers()
* remove chains cleanup from stop_service() due to exclusive use of fw4 nft files
* improve status_service() output
* drop input and postrouting as valid options for policy chain

Uci-defaults files:
* 91-pbr-nft: cosmetic improvements

Default nft files:
* drop use of input and postrouting chanins

Custom User files:
* dns-prefetch: functional improvements (thanks @betonmischer86)

Signed-off-by: Stan Grishin <[email protected]>