Update properties-editor UI and code + minor fix in nm-l2tp-service

Code much sychronized with network-manager-pptp (master 8b5c8b6ca3d24f7b5f736b8a7a29956f0bce35f3)
Now works with beeline-moscow tp.internet.beeline.ru

properties/nm-l2tp-dialog.ui

@@ -726,15 +726,15 @@
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="n_rows">4</property>
-                <property name="n_columns">2</property>
+                <property name="n_columns">3</property>
                 <property name="column_spacing">12</property>
                 <property name="row_spacing">6</property>
                 <child>
                   <object class="GtkEntry" id="domain_entry">
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
-                    <property name="primary_icon_activatable">False</property>
-                    <property name="secondary_icon_activatable">False</property>
+                    <property name="invisible_char">•</property>
+                    <property name="invisible_char_set">True</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -765,6 +765,7 @@
                     <property name="can_focus">True</property>
                     <property name="receives_default">False</property>
                     <property name="use_action_appearance">False</property>
+                    <property name="xalign">0</property>
                     <property name="draw_indicator">True</property>
                   </object>
                   <packing>
@@ -775,13 +776,32 @@
                     <property name="y_options"></property>
                   </packing>
                 </child>
+                <child>
+                  <object class="GtkComboBox" id="user_pass_type_combo">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="model">model2</property>
+                    <child>
+                      <object class="GtkCellRendererText" id="renderer2"/>
+                      <attributes>
+                        <attribute name="text">0</attribute>
+                      </attributes>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="left_attach">2</property>
+                    <property name="right_attach">3</property>
+                    <property name="top_attach">1</property>
+                    <property name="bottom_attach">2</property>
+                  </packing>
+                </child>
                 <child>
                   <object class="GtkEntry" id="user_password_entry">
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="visibility">False</property>
-                    <property name="primary_icon_activatable">False</property>
-                    <property name="secondary_icon_activatable">False</property>
+                    <property name="invisible_char">•</property>
+                    <property name="invisible_char_set">True</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -809,8 +829,8 @@
                   <object class="GtkEntry" id="user_entry">
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
-                    <property name="primary_icon_activatable">False</property>
-                    <property name="secondary_icon_activatable">False</property>
+                    <property name="invisible_char">•</property>
+                    <property name="invisible_char_set">True</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -833,6 +853,15 @@
                 <child>
                   <placeholder/>
                 </child>
+                <child>
+                  <placeholder/>
+                </child>
+                <child>
+                  <placeholder/>
+                </child>
+                <child>
+                  <placeholder/>
+                </child>
               </object>
             </child>
           </object>

src/nm-l2tp-service.c

@@ -405,6 +405,7 @@ static ValidProperty valid_properties[] = {
 	{ NM_L2TP_KEY_USE_ACCOMP,        G_TYPE_BOOLEAN, FALSE },
 	{ NM_L2TP_KEY_LCP_ECHO_FAILURE,  G_TYPE_UINT, FALSE },
 	{ NM_L2TP_KEY_LCP_ECHO_INTERVAL, G_TYPE_UINT, FALSE },
+	{ NM_L2TP_KEY_PASSWORD"-flags",  G_TYPE_UINT, FALSE },
 	{ NM_L2TP_KEY_IPSEC_ENABLE,      G_TYPE_BOOLEAN, FALSE },
 	{ NM_L2TP_KEY_IPSEC_GATEWAY_ID,  G_TYPE_STRING, FALSE },
 	{ NM_L2TP_KEY_IPSEC_GROUP_NAME,  G_TYPE_STRING, FALSE },