net: ipv6: Return neighbors in foreach function by interface order
net: ipv6: Return neighbors in foreach function by interface order

It is useful to return the neighbors in net_ipv6_nbr_foreach()
groupped by network interface. This way the caller has them
already in proper order and does not need to re-group them.

Signed-off-by: Jukka Rissanen <f9f077d1da4c7aa947f9864fa5a28c3588f6a45d@linux.intel.com>

kraj/zephyr,finikorg/zephyr,mbolivar/zephyr,punitvara/zephyr,zephyriot/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,explora26/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,fbsder/zephyr,mbolivar/zephyr,ldts/zephyr,Vudentz/zephyr,explora26/zephyr,punitvara/zephyr,aceofall/zephyr-iotos,kraj/zephyr,nashif/zephyr,fbsder/zephyr,ldts/zephyr,kraj/zephyr,Vudentz/zephyr,galak/zephyr,punitvara/zephyr,mbolivar/zephyr,galak/zephyr,ldts/zephyr,explora26/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,fbsder/zephyr,finikorg/zephyr,fbsder/zephyr,zephyriot/zephyr,nashif/zephyr,aceofall/zephyr-iotos,GiulianoFranchetto/zephyr,explora26/zephyr,ldts/zephyr,explora26/zephyr,zephyriot/zephyr,fbsder/zephyr,kraj/zephyr,mbolivar/zephyr,ldts/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,nashif/zephyr,finikorg/zephyr,kraj/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,galak/zephyr,zephyriot/zephyr,zephyriot/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,punitvara/zephyr,Vudentz/zephyr,finikorg/zephyr