ctdb-scripts: Avoid chellcheck warning SC2012 (ls for file list)

ctdb-scripts: Avoid chellcheck warning SC2012 (ls for file list)

SC2012: Use find instead of ls to better handle non-alphanumeric filenames.

Make this cope better with unexpected whitespace.

Unfortunately, this results in shellcheck warning:

  SC2035: Use ./*.tdb.* so names with dashes won't become options.

No!  Then stat(1) will print ./file.tdb.X.  We want the basenames and
we know the filenames don't start with dashes.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>