addr: Support setting local/peer/anycast/multicast/broadcast address to NULL
addr: Support setting local/peer/anycast/multicast/broadcast address to NULL

Signed-off-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>

cyclops8456/libnl3,tgraf/libnl,Distrotech/libnl,claudelee/libnl,karlhiramoto/libnl,teto/libnl_old,houstar/libnl,thom311/libnl,HolyShitMan/libnl-1,claudelee/libnl,teto/libnl_old,UnicronNL/libnl3,cfriedt/libnl,mshirley/libnl,kolyshkin/libnl,cyclops8456/libnl3,tklauser/libnl,honsys/libnl,mshirley/libnl,HolyShitMan/libnl-1,mshirley/libnl,baloo/libnl,dsahern/libnl,HolyShitMan/libnl-1,thom311/libnl,tgraf/libnl,kolyshkin/libnl,vyos/libnl3,cfriedt/libnl,karlhiramoto/libnl,baloo/libnl,greearb/libnl-ct,baloo/libnl,tgraf/libnl,houstar/libnl,chitranshi/libnl,chitranshi/libnl,Distrotech/libnl,dsahern/libnl,vyos/libnl3,chitranshi/libnl,kolyshkin/libnl,cyclops8456/libnl3,teto/libnl_old,dsahern/libnl,congwang/libnl,Distrotech/libnl,UnicronNL/libnl3,karlhiramoto/libnl,vyos/libnl3,mshirley/libnl,claudelee/libnl,chitranshi/libnl,honsys/libnl,congwang/libnl,dsahern/libnl,baloo/libnl,vyos/libnl3,HolyShitMan/libnl-1,houstar/libnl,thom311/libnl,tgraf/libnl,honsys/libnl,UnicronNL/libnl3,congwang/libnl,claudelee/libnl,kolyshkin/libnl,cfriedt/libnl,tklauser/libnl,Distrotech/libnl,UnicronNL/libnl3,cyclops8456/libnl3,honsys/libnl,houstar/libnl,cfriedt/libnl,karlhiramoto/libnl,teto/libnl_old,greearb/libnl-ct,tklauser/libnl,greearb/libnl-ct,tklauser/libnl,congwang/libnl