storage: Ignore errors resizing partition during initial setup

On Raspberry Pi 3B+ image, it was observed that resizing partition fails during
initial setup. Due to this, Apache, SSH and Plinth become unavailable. Since
resizing the partition is not a critical operation to perform to bring up
FreedomBox, it is safe it ignore the error. In these cases, the user will have
to the storage app and retry manually after bring prompted by low disk space
message.

Tests:

- Introduce deliberate error in expand partition operation. Modify code to
  always detect that partition can be expanded. Remove storage module from
  plinth_module table in plinth.sqlite3. Run plinth. Notice that storage setup
  is run but expanding partition fails. Even after expanding partition fails,
  storage module is fully setup. Plinth proceeds with starting web server and
  storage module is found in the plinth_module table of plinth.sqlite3.

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

plinth/modules/storage/__init__.py

@@ -27,7 +27,7 @@ from plinth import actions
 from plinth import app as app_module
 from plinth import cfg, menu, utils
 from plinth.daemon import Daemon
-from plinth.errors import PlinthError
+from plinth.errors import ActionError, PlinthError
 from plinth.utils import format_lazy, import_from_gi
 
 from .manifest import backup  # noqa, pylint: disable=unused-import
@@ -281,4 +281,7 @@ def setup(helper, old_version=None):
     disks = get_disks()
     root_device = get_root_device(disks)
     if is_expandable(root_device):
-        expand_partition(root_device)
+        try:
+            expand_partition(root_device)
+        except ActionError:
+            pass