lib/file/afs_io: use a small IO size for HTTPS writes
lib/file/afs_io: use a small IO size for HTTPS writes

I currently encounter libevent request timeouts when issuing 32KB or
above PUT requests via HTTPS. However, HTTP based requests are fine.

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

ddiss/elasto,ddiss/elasto