`spinel.c`: Remove the `SPINEL` prefix from strings returned by `spinel_prop_key_to_cstr()` (#1761)
`spinel.c`: Remove the `SPINEL` prefix from strings returned by `spinel_prop_key_to_cstr()` (#1761)


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