currentLoad() workarround for empty os.cpus info

lib/cpu.js

@@ -1142,7 +1142,7 @@ function getLoad() {
         let totalIrq = 0;
         let totalIdle = 0;
         let cores = [];
-        _corecount = (cpus && cpus.length) ? cpus.length : 1;
+        _corecount = (cpus && cpus.length) ? cpus.length : 0;
 
         for (let i = 0; i < _corecount; i++) {
           const cpu = cpus[i].times;

lib/network.js

@@ -763,7 +763,7 @@ function networkInterfaces(callback) {
                 }
                 mac = details.mac;
                 // fallback due to https://github.com/nodejs/node/issues/13581 (node 8.1 - node 8.2)
-                if (mac.indexOf('00:00:0') > -1 && (_linux || _darwin)) {
+                if (mac.indexOf('00:00:0') > -1 && (_linux || _darwin) && parseInt(process.versions.node.split('.'), 10) === 8) {
                   if (Object.keys(_mac).length === 0) {
                     _mac = getMacAddresses();
                   }