Add client certificate support

mon/etcd_adapter.js

@@ -23,6 +23,10 @@ class EtcdAdapter
     parse_config(config)
     {
         this.parse_etcd_addresses(config.etcd_address||config.etcd_url);
+        if (config.mon_etcd_client_cert || config.etcd_client_cert)
+            this.opts.cert = fs.readFileSync(config.mon_etcd_client_cert || config.etcd_client_cert, { encoding: 'utf-8' });
+        if (config.mon_etcd_client_key || config.etcd_client_key)
+            this.opts.key = fs.readFileSync(config.mon_etcd_client_key || config.etcd_client_key, { encoding: 'utf-8' });
         if (config.etcd_ca)
             this.opts.ca = fs.readFileSync(config.etcd_ca, { encoding: 'utf-8' });
     }

mon/etcd_schema.js

@@ -45,7 +45,10 @@ const etcd_tree = {
             config_path: "/etc/vitastor/vitastor.conf",
             etcd_prefix: "/vitastor",
             // etcd connection - configurable online
-            etcd_address: "10.0.115.10:2379/v3",
+            etcd_address: "http://10.0.115.10:2379/v3",
+            etcd_client_cert: "",
+            etcd_client_key: "",
+            etcd_ca: "",
             // mon
             etcd_mon_ttl: 5, // min: 1
             etcd_mon_timeout: 1000, // ms. min: 0