test/cm_file: Azure File Service IO and readdir tests
test/cm_file: Azure File Service IO and readdir tests

These tests check that sparse file IO works as expected, and that
directories with special characters are created.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

ddiss/elasto,ddiss/elasto