test-gdb: move to pure python calls

getvar

@@ -1,13 +1,13 @@
 #!/usr/bin/env python3
 
-import types
-
 import common
-from shell_helpers import LF
 
 class Main(common.LkmcCliFunction):
     def __init__(self):
         super().__init__(
+            defaults={
+                'print_time': False,
+            },
             description='''\
 Print the value of a self.env['py'] variable.
 
@@ -28,7 +28,6 @@ List all available variables:
 ./%(prog)s
 ....
 ''',
-            do_print_time=False,
         )
         self.add_argument('variable', nargs='?')