A set operation at the hive level (full path).

async def set(self, full, valu):
        '''
        A set operation at the hive level (full path).
        '''
        node = await self._getHiveNode(full)

        oldv = node.valu

        node.valu = await self.storNodeValu(full, valu)

        await node.fire('hive:set', path=full, valu=valu, oldv=oldv)

        return oldv