EX-7528 lov: fallocate is not allowed for compressed files

EX-7528 lov: fallocate is not allowed for compressed files

Client Side Data Compression allocates blocks after a compression.
It is impossible to preallocate blocks for the whole file, so
fallocate should be disabled in case of compression.

Signed-off-by: Artem Blagodarenko <ablagodarenko@ddn.com>
Change-Id: Ie834ace183fdcec0d7d6f747237e0964c3c4120b
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51059
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>