use CoAP POST for Network Diagnostic messages (#1142)
use CoAP POST for Network Diagnostic messages (#1142)


gandreello/openthread,JakubBrachTieto/openthread,chshu/openthread,georgecpr/openthread,jwhui/openthread,jjlee3/openthread,aeliot/openthread,georgecpr/openthread,GiedriusM/openthread,LeZhang2016/openthread,pvanhorn/openthread,lanyuwen/openthread,srickardti/openthread,JakubBrachTieto/openthread,nibanks/openthread,mszczodrak/openthread,JakubBrachTieto/openthread,nibanks/openthread,openthread/openthread,gandreello/openthread,jwhui/openthread,lanyuwen/openthread,jjlee9/openthread,fbsder/openthread,pvanhorn/openthread,erja-gp/openthread,chshu/openthread,xiaom-GitHub/openthread,nibanks/openthread,jjlee3/openthread,xiaom-GitHub/openthread,bukepo/openthread,lanyuwen/openthread,mszczodrak/openthread,erja-gp/openthread,turon/openthread,JakubBrachTieto/openthread,bukepo/openthread,Zolertia/openthread,jjlee3/openthread,JakubBrachTieto/openthread,lanyuwen/openthread,gandreello/openthread,turon/openthread,turon/openthread,erja-gp/openthread,xiaom-GitHub/openthread,aeliot/openthread,erja-gp/openthread,bukepo/openthread,LeZhang2016/openthread,abtink/openthread,turon/openthread,georgecpr/openthread,fbsder/openthread,xiaom-GitHub/openthread,jjlee9/openthread,nibanks/openthread,jwhui/openthread,erja-gp/openthread,gandreello/openthread,librasungirl/openthread,LeZhang2016/openthread,vaas-krish/openthread,fbsder/openthread,mszczodrak/openthread,fbsder/openthread,Zolertia/openthread,pvanhorn/openthread,aeliot/openthread,nibanks/openthread,librasungirl/openthread,LeZhang2016/openthread,GiedriusM/openthread,LeZhang2016/openthread,pvanhorn/openthread,georgecpr/openthread,vaas-krish/openthread,Zolertia/openthread,chshu/openthread,gandreello/openthread,aeliot/openthread,lanyuwen/openthread,aeliot/openthread,xiaom-GitHub/openthread,Zolertia/openthread,abtink/openthread,srickardti/openthread,librasungirl/openthread,openthread/openthread,GiedriusM/openthread,JakubBrachTieto/openthread,jjlee9/openthread,GiedriusM/openthread,georgecpr/openthread,jjlee9/openthread,jjlee9/openthread,srickardti/openthread,openthread/openthread,fbsder/openthread,pvanhorn/openthread,mszczodrak/openthread,jjlee3/openthread,Zolertia/openthread,srickardti/openthread,lanyuwen/openthread,vaas-krish/openthread,chshu/openthread,chshu/openthread,xiaom-GitHub/openthread,chshu/openthread,LeZhang2016/openthread,abtink/openthread,vaas-krish/openthread,erja-gp/openthread,gandreello/openthread,bukepo/openthread,GiedriusM/openthread,librasungirl/openthread,vaas-krish/openthread,nibanks/openthread,jjlee3/openthread,mszczodrak/openthread,abtink/openthread,jwhui/openthread,georgecpr/openthread,openthread/openthread,vaas-krish/openthread,pvanhorn/openthread,fbsder/openthread,aeliot/openthread,jjlee9/openthread,mszczodrak/openthread