AdminShutdown exception from swh-indexer-storage should not be reported to Sentry

Sentry Issue: SWH-INDEXER-T4

AdminShutdown: terminating connection due to administrator command
FATAL:  server conn crashed?
server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.

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  File "swh/indexer/storage/__init__.py", line 349, in content_mimetype_get
    for c in db.content_mimetype_get_from_list(ids, cur)
  File "swh/indexer/storage/__init__.py", line 346, in <listcomp>
    ContentMimetypeRow.from_dict(
  File "swh/indexer/storage/db.py", line 179, in content_mimetype_get_from_list
    "content_mimetype", ids, self.content_mimetype_cols, cur=cur
  File "swh/indexer/storage/db.py", line 125, in _get_from_list
    yield from execute_values_generator(cur, query, ((_id,) for _id in ids))
  File "swh/core/db/db_utils.py", line 478, in execute_values_generator
    cur.execute(b"".join(parts))