[mle] allow REED to attach to a better partition (#2483)
[mle] allow REED to attach to a better partition (#2483)


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