Add checkbox to enable SSL connection for SPICE

If in OpenNebula not enabled TLS for SPICE protocol, when
cannot connect to OpenNebula with generated virt-viewer connection
config file, because "secure-channel" options successfully work
over TLS only.
This changes allow enable or disable TLS on UDS site.

server/src/uds/transports/SPICE/remote_viewer_file.py

@@ -65,6 +65,7 @@ class RemoteViewerFile:
     usb_auto_share: bool = True
     new_usb_auto_share: bool = False
     delete_file: bool = True
+    ssl_connection: bool = False
 
     def __init__(
         self,
@@ -101,6 +102,7 @@ class RemoteViewerFile:
         delete_file = '01'[self.delete_file]
         usb_auto_share = '01'[self.usb_auto_share]
         new_usb_auto_share = '01'[self.new_usb_auto_share]
+        ssl_connection = '01'[self.ssl_connection]
 
         ca = self.ca.strip().replace(
             '\n', '\\n'
@@ -121,6 +123,6 @@ class RemoteViewerFile:
             host_subject=self.host_subject if tls_port != '-1' else '',
             ca=ca if tls_port != '-1' else '',
             secure_channel='secure-channels=main;inputs;cursor;playback;record;display;usbredir;smartcard'
-            if tls_port != '-1'
+            if ssl_connection and tls_port != '-1'
             else '',
         )

server/src/uds/transports/SPICE/spice.py

@@ -64,6 +64,7 @@ class SPICETransport(BaseSpiceTransport):
     usbShare = BaseSpiceTransport.usbShare
     autoNewUsbShare = BaseSpiceTransport.autoNewUsbShare
     smartCardRedirect = BaseSpiceTransport.smartCardRedirect
+    sslConnection = BaseSpiceTransport.SSLConnection
 
     def getUDSTransportScript(
         self,
@@ -98,6 +99,7 @@ class SPICETransport(BaseSpiceTransport):
         r.usb_auto_share = self.usbShare.isTrue()
         r.new_usb_auto_share = self.autoNewUsbShare.isTrue()
         r.smartcard = self.smartCardRedirect.isTrue()
+        r.ssl = self.sslConnection.isTrue()
 
         osName = {
             OsDetector.KnownOS.Windows: 'windows',

server/src/uds/transports/SPICE/spice_base.py

@@ -113,6 +113,12 @@ class BaseSpiceTransport(transports.Transport):
         defvalue=gui.FALSE,
         tab=gui.ADVANCED_TAB,
     )
+    SSLConnection = gui.CheckBoxField(
+        order=9,
+        label=_('SSL Connection'),
+        tooltip=_('If checked, SPICE protocol will required SSL connection.'),
+        defvalue=gui.FALSE,
+    )
 
     def isAvailableFor(self, userService: 'models.UserService', ip: str) -> bool:
         """