lib/file_api: add content_type field to struct elasto_fstat
lib/file_api: add content_type field to struct elasto_fstat

To be retuned on object / file / blob fstats.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@samba.org>

ddiss/elasto,ddiss/elasto