migration: Update error message

Signed-off-by: lcheng <[email protected]>

libvirt/tests/cfg/migration_with_copy_storage/network_data_transport/tls_wrong_cert_configurations.cfg

@@ -46,7 +46,7 @@
     variants cert_configuration:
         - no_client_cert_on_src:
             cert_path = "${custom_pki_path}/client-cert.pem"
-            err_msg = "Cannot read from TLS channel: Software caused connection abort"
+            err_msg = "Cannot read from TLS channel:"
         - no_server_cert_on_target:
             cert_path = "${custom_pki_path}/server-cert.pem"
             err_msg = "unable to execute QEMU command 'object-add': Unable to access credentials ${cert_path}: No such file or directory"