Rewrite cipher benchmark loop.

Using getrusage seems toi give not adequate precision,
so use clock_gettime and try to scale buffer size a bit
on high performance systems.

If it still fail, return ERANGE error instead calculating
completely unreliable numbers.

Should fix Issue#186.
Update po files.
Fix TCRYPT system encryption mapping for multiple partitions.

Since this commit, one can use partition directly as device parameter.

Should fix Issue#183 and Issue#188.
Remove obsoleted warning.
Fix wrong block size if used on 4k block fs through loop device.

Always use page size if running through loop device.
Fix reencryption tool to work with 4k devices.

See https://bugzilla.redhat.com/show_bug.cgi?id=1029032#c7

Thanks to Ondra Kozina to figure this out.
Add new test images to automake file list.
Fix previous commit.