[mle] skip IPv6 address registration entries with no matching context (#2604)
[mle] skip IPv6 address registration entries with no matching context (#2604)


gandreello/openthread,chshu/openthread,erja-gp/openthread,turon/openthread,openthread/openthread,gandreello/openthread,mszczodrak/openthread,georgecpr/openthread,LeZhang2016/openthread,LeZhang2016/openthread,srickardti/openthread,pvanhorn/openthread,georgecpr/openthread,georgecpr/openthread,chshu/openthread,bukepo/openthread,turon/openthread,pvanhorn/openthread,lanyuwen/openthread,librasungirl/openthread,librasungirl/openthread,LeZhang2016/openthread,LeZhang2016/openthread,openthread/openthread,lanyuwen/openthread,erja-gp/openthread,erja-gp/openthread,erja-gp/openthread,lanyuwen/openthread,turon/openthread,mszczodrak/openthread,openthread/openthread,chshu/openthread,mszczodrak/openthread,srickardti/openthread,LeZhang2016/openthread,jwhui/openthread,abtink/openthread,chshu/openthread,chshu/openthread,erja-gp/openthread,pvanhorn/openthread,mszczodrak/openthread,pvanhorn/openthread,pvanhorn/openthread,pvanhorn/openthread,lanyuwen/openthread,librasungirl/openthread,gandreello/openthread,gandreello/openthread,georgecpr/openthread,erja-gp/openthread,turon/openthread,srickardti/openthread,mszczodrak/openthread,openthread/openthread,mszczodrak/openthread,georgecpr/openthread,lanyuwen/openthread,gandreello/openthread,jwhui/openthread,abtink/openthread,lanyuwen/openthread,gandreello/openthread,jwhui/openthread,bukepo/openthread,abtink/openthread,abtink/openthread,jwhui/openthread,librasungirl/openthread,LeZhang2016/openthread,bukepo/openthread,georgecpr/openthread,bukepo/openthread,chshu/openthread,srickardti/openthread