Support additional tls.connect() options (#1996)

* Support additional tls.connect() options

* Pass-through all ssl options to tls.connect()

* Fix lint error

* Remove tls.checkServerIdentity explicit option

lib/connection.js

@@ -91,18 +91,9 @@ Connection.prototype.connect = function (port, host) {
         return self.emit('error', new Error('There was an error establishing an SSL connection'))
     }
     var tls = require('tls')
-    const options = {
-      socket: self.stream,
-      checkServerIdentity: self.ssl.checkServerIdentity || tls.checkServerIdentity,
-      rejectUnauthorized: self.ssl.rejectUnauthorized,
-      ca: self.ssl.ca,
-      pfx: self.ssl.pfx,
-      key: self.ssl.key,
-      passphrase: self.ssl.passphrase,
-      cert: self.ssl.cert,
-      secureOptions: self.ssl.secureOptions,
-      NPNProtocols: self.ssl.NPNProtocols
-    }
+    const options = Object.assign({
+      socket: self.stream
+    }, self.ssl)
     if (net.isIP(host) === 0) {
       options.servername = host
     }