Patch for Fio 1.21 plus changes up to de79c9158eae1459970e0df6efc6a2b09d920f15

Hi Jens,

There is a set of patches for the problems we found in fio 1.21. It
would be great if you can check them in during the next update. Please
let me know if you have any question about these bugs. Some of the
bugs can be reproduced via example/surface-scan.

Bugs fixed:
eta.c
* When fill_device is set to 1 and the iosize is unset, fio can't
estimate ETA correctly.
* When exitall_on_terminate is set, ETA is not correctly shown.

filehash.c:
* When file is not in the flist_entry, filename should be checked
before doing strcmp to avoid segmentation fault.

filesetup.c:
* When using direct IO, invalidate_cache should return immediately.
* When terse_output is set, The 'laying out' message should not be displayed.
* Filehash should be removed after the file is closed.

smalloc.c:
* Remove read/write lock race condition which will result in segmentation fault.