fold sysinfo into network

the backends are network backends

src/reverseproxy.js

@@ -48,13 +48,13 @@ const acme2 = require('./acme2.js'),
     eventlog = require('./eventlog.js'),
     fs = require('fs'),
     mail = require('./mail.js'),
+    network = require('./network.js'),
     os = require('os'),
     path = require('path'),
     paths = require('./paths.js'),
     safe = require('safetydance'),
     settings = require('./settings.js'),
     shell = require('./shell.js'),
-    sysinfo = require('./sysinfo.js'),
     util = require('util'),
     validator = require('validator');
 
@@ -448,7 +448,7 @@ async function writeDashboardNginxConfig(vhost, certificatePath) {
     const data = {
         sourceDir: path.resolve(__dirname, '..'),
         vhost,
-        hasIPv6: sysinfo.hasIPv6(),
+        hasIPv6: network.hasIPv6(),
         endpoint: 'dashboard',
         certFilePath: certificatePath.certFilePath,
         keyFilePath: certificatePath.keyFilePath,
@@ -486,7 +486,7 @@ async function writeAppLocationNginxConfig(app, location, certificatePath) {
     const data = {
         sourceDir: path.resolve(__dirname, '..'),
         vhost,
-        hasIPv6: sysinfo.hasIPv6(),
+        hasIPv6: network.hasIPv6(),
         ip: null,
         port: null,
         endpoint: null,
@@ -713,7 +713,7 @@ async function writeDefaultConfig(options) {
     const data = {
         sourceDir: path.resolve(__dirname, '..'),
         vhost: '',
-        hasIPv6: sysinfo.hasIPv6(),
+        hasIPv6: network.hasIPv6(),
         endpoint: options.activated ? 'ip' : 'setup',
         certFilePath,
         keyFilePath,