system: route to get filesystem

src/test/system-test.js

@@ -24,7 +24,7 @@ describe('System', function () {
         // does not work on archlinux 8!
         if (require('child_process').execSync('uname -a').toString().indexOf('-arch') !== -1) return;
 
-        const disks = await system._getFilesystems();
+        const disks = await system.getFilesystems();
         expect(disks).to.be.ok();
         expect(Object.keys(disks).some(fs => disks[fs].mountpoint === '/')).to.be.ok();
     });