VR: fix password server exception when no password is found (#9699)

see errors in /var/log/daemon.log below
```
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]: ----------------------------------------
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]: Exception occurred during processing of request from ('192.168.20.8', 51108)
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]: Traceback (most recent call last):
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/socketserver.py", line 691, in process_request_thread
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self.finish_request(request, client_address)
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/socketserver.py", line 361, in finish_request
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self.RequestHandlerClass(request, client_address, self)
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/socketserver.py", line 755, in __init__
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self.handle()
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/http/server.py", line 432, in handle
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self.handle_one_request()
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/http/server.py", line 420, in handle_one_request
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     method()
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/opt/cloud/bin/passwd_server_ip.py", line 117, in do_GET
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self.wfile.write('saved_password')
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:   File "/usr/lib/python3.11/socketserver.py", line 834, in write
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]:     self._sock.sendall(b)
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]: TypeError: a bytes-like object is required, not 'str'
Sep 13 12:36:58 systemvm passwd_server_ip.py[2154]: ----------------------------------------
```

Author: weizhouapache

systemvm/debian/opt/cloud/bin/passwd_server_ip.py

@@ -114,19 +114,19 @@ def do_GET(self):
         if requestType == 'send_my_password':
             password = getPassword(clientAddress)
             if not password:
-                self.wfile.write('saved_password')
+                self.wfile.write('saved_password'.encode())
                 syslog.syslog('serve_password: requested password not found for %s' % clientAddress)
             else:
                 self.wfile.write(password.encode())
                 syslog.syslog('serve_password: password sent to %s' % clientAddress)
         elif requestType == 'saved_password':
             removePassword(clientAddress)
             savePasswordFile()
-            self.wfile.write('saved_password')
+            self.wfile.write('saved_password'.encode())
             syslog.syslog('serve_password: saved_password ack received from %s' % clientAddress)
         else:
             self.send_response(400)
-            self.wfile.write('bad_request')
+            self.wfile.write('bad_request'.encode())
             syslog.syslog('serve_password: bad_request from IP %s' % clientAddress)
         return