sstables: Make log more useful when compressed chunk fails checksum
sstables: Make log more useful when compressed chunk fails checksum

The current log is useless when checksum fails, you don't know
which compressed chunk failed checksum, the expected and the
actual checksum, the size of chunk and so on.

Before:
compressed chunk failed checksum
Now:
compressed chunk of size 3735 at file offset 406491 failed checksum, expected=0, actual=1422312584

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla