LU-12275 tests: exercise file content encryption/decryption

LU-12275 tests: exercise file content encryption/decryption

Add new tests to sanity-sec in order to exercise file content
encryption/decryption. Also test encrypted file length, especially
when multiple threads are writting to the same file in parallel.

Test-Parameters: trivial
Test-Parameters: clientdistro=el8.1 testgroup=review-ldiskfs
Test-Parameters: clientdistro=el8.1 testgroup=review-ldiskfs-dne
Test-Parameters: clientdistro=el8.1 testgroup=review-ldiskfs-arm
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-selinux
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-part-1 env=SANITYN_EXCEPT=106
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-part-2 env=SANITY_PCC_EXCEPT="4"
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-part-3
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-part-4
Test-Parameters: clientdistro=el8.1 testgroup=review-zfs
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-zfs-part-1 env=SANITYN_EXCEPT=106
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-zfs-part-2 env=SANITY_PCC_EXCEPT="4"
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-zfs-part-3
Test-Parameters: clientdistro=el8.1 testgroup=review-dne-zfs-part-4
Test-Parameters: testlist=sanity-sec envdefinitions=ONLY="36 37 38 39 40 41 42 43 44 45 46 47 48" clientdistro=el8.1 fstype=ldiskfs
Test-Parameters: testlist=sanity-sec envdefinitions=ONLY="36 37 38 39 40 41 42 43 44 45 46 47 48" clientdistro=el8.1 fstype=zfs
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I339e748e0213da980fe7779bb06ae9b3bd91bf5c
Reviewed-on: https://review.whamcloud.com/36191
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>