Send legacy parameters on login call

To support login on old HSes

src/Login.js

@@ -111,23 +111,32 @@ export default class Login {
         const isEmail = username.indexOf("@") > 0;
 
         let identifier;
+        let legacyParams; // parameters added to support old HSes
         if (phoneCountry && phoneNumber) {
             identifier = {
                 type: 'm.id.phone',
                 country: phoneCountry,
                 number: phoneNumber,
             };
+            // No legacy support for phone number login
         } else if (isEmail) {
             identifier = {
                 type: 'm.id.thirdparty',
                 medium: 'email',
                 address: username,
             };
+            legacyParams = {
+                medium: 'email',
+                address: username,
+            };
         } else {
             identifier = {
                 type: 'm.id.user',
                 user: username,
             };
+            legacyParams = {
+                user: username,
+            };
         }
 
         const loginParams = {
@@ -135,6 +144,7 @@ export default class Login {
             identifier: identifier,
             initial_device_display_name: this._defaultDeviceDisplayName,
         };
+        Object.assign(loginParams, legacyParams);
 
         const client = this._createTemporaryClient();
         return client.login('m.login.password', loginParams).then(function(data) {