LU-14160 fallocate: Add punch mode to fallocate

LU-14160 fallocate: Add punch mode to fallocate

This patch adds fallocate(2) punch operation
(FALLOCATE_FL_PUNCH_HOLE) mode support for ldiskfs backend
OSD and for OSC/OST

Test cases sanity/150{f,g} are added for verification.
FSX test was modified:
 - add 'punch' operation to an output
 - fix 'No space' problem when fallocate length become negative
 - fix wrong bytes number in output

Test-Parameters: testlist=sanity ostsizegb=12 env=ONLY="150f 150g"
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I0c180d413efdf995823e25d5c340013bec0c8611
Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40877
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>