net: tests: Fix nbr lookup in route tests
net: tests: Fix nbr lookup in route tests

The neighbor was added very fragile way into neighbor cache which
caused following queries to fail. This is now fixed by manually
adding neighbor to the cache.

Change-Id: I1831557fd5f9df5afd0a6c6833b0af769f5167eb
Signed-off-by: Jukka Rissanen <f9f077d1da4c7aa947f9864fa5a28c3588f6a45d@linux.intel.com>

punitvara/zephyr,punitvara/zephyr,Vudentz/zephyr,holtmann/zephyr,fractalclone/zephyr-riscv,explora26/zephyr,rsalveti/zephyr,fbsder/zephyr,runchip/zephyr-cc3220,sharronliu/zephyr,Vudentz/zephyr,erwango/zephyr,runchip/zephyr-cc3200,mbolivar/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,kraj/zephyr,sharronliu/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,explora26/zephyr,rsalveti/zephyr,bigdinotech/zephyr,zephyrproject-rtos/zephyr,bigdinotech/zephyr,mbolivar/zephyr,bboozzoo/zephyr,nashif/zephyr,rsalveti/zephyr,mbolivar/zephyr,ldts/zephyr,runchip/zephyr-cc3220,sharronliu/zephyr,nashif/zephyr,runchip/zephyr-cc3220,erwango/zephyr,erwango/zephyr,GiulianoFranchetto/zephyr,erwango/zephyr,bboozzoo/zephyr,aceofall/zephyr-iotos,nashif/zephyr,kraj/zephyr,aceofall/zephyr-iotos,GiulianoFranchetto/zephyr,zephyriot/zephyr,Vudentz/zephyr,fbsder/zephyr,pklazy/zephyr,zephyriot/zephyr,kraj/zephyr,nashif/zephyr,rsalveti/zephyr,runchip/zephyr-cc3200,bboozzoo/zephyr,punitvara/zephyr,explora26/zephyr,mbolivar/zephyr,ldts/zephyr,galak/zephyr,fbsder/zephyr,fbsder/zephyr,pklazy/zephyr,fractalclone/zephyr-riscv,sharronliu/zephyr,mbolivar/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,bigdinotech/zephyr,holtmann/zephyr,runchip/zephyr-cc3220,Vudentz/zephyr,ldts/zephyr,sharronliu/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,holtmann/zephyr,runchip/zephyr-cc3200,bigdinotech/zephyr,finikorg/zephyr,galak/zephyr,fractalclone/zephyr-riscv,kraj/zephyr,finikorg/zephyr,nashif/zephyr,holtmann/zephyr,runchip/zephyr-cc3200,galak/zephyr,fractalclone/zephyr-riscv,bboozzoo/zephyr,punitvara/zephyr,pklazy/zephyr,holtmann/zephyr,pklazy/zephyr,Vudentz/zephyr,finikorg/zephyr,runchip/zephyr-cc3220,kraj/zephyr,runchip/zephyr-cc3200,fractalclone/zephyr-riscv,GiulianoFranchetto/zephyr,rsalveti/zephyr,ldts/zephyr,pklazy/zephyr,punitvara/zephyr,zephyriot/zephyr,galak/zephyr,bigdinotech/zephyr,explora26/zephyr,explora26/zephyr,zephyriot/zephyr,bboozzoo/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,fbsder/zephyr,erwango/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,finikorg/zephyr