container: Avoid a warning that interactive mode is intended

Currently, with recent version of systemd on host machine, running './container
up' results in the following warning thrown many times. Fix this.

  Console mode 'pipe' selected, but standard input/output are connected to an
  interactive TTY. Most likely you want to use 'interactive' console mode for
  proper interactivity and shell job control. Proceeding anyway.

Tests:

- With systemd version 248 on host machine, run './container up' and notice that
warning is no longer printed.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

container

@@ -551,7 +551,12 @@ def _resize_disk_image(image_file, new_size):
 
 def _get_nspawn_command(image_file):
     """Return the base nspwan command."""
-    pipe_argument = ['--pipe'] if systemd_version > 241 else []
+    pipe_argument = []
+    if systemd_version >= 247:
+        pipe_argument = ['--console=autopipe']
+    elif systemd_version > 241:
+        pipe_argument = ['--console=pipe']
+
     return [
         'sudo',
         'systemd-nspawn',