LU-15259 tests: use existing usernames for setfacl

LU-15259 tests: use existing usernames for setfacl

In SLES15.2 and Ubutntu 20 the "bin" and "daemon" users are not
defined in /etc/passwd, causing setfacl to print a cryptic error:

  setfacl -m u:bin:rw f -- failed
  ~     ? setfacl: Option -m: Invalid argument near character 3

Replace "bin" and "daemon" in ACL tests so they are run with user
and group names that exist on all distros currently being tested.
They can also be specified via ACLUSR1/ACLUSR2 in the test config.

The "permission_xattr" test also needs "nobody" user and group.

Also, the "getfacl" command prints users and groups in numerical
order, so the ACL tests will fail if "daemon" < "bin", or if either
group is higher than the "users" group.  Fix them as needed.

Lustre-change: https://review.whamcloud.com/45627
Lustre-commit: 60188994e24b95db5915b8e6802f7963ffb2fd9c

Test-Parameters: trivial testlist=sanity-quota,sanity-sec,pjdfstest
Test-Parameters: testlist=sanity env=ONLY=103-154 clientdistro=el7.9 serverdistro=el7.9
Test-Parameters: testlist=sanity env=ONLY=103-154 clientdistro=el8.6
Test-Parameters: testlist=sanity env=ONLY=103-154 clientdistro=ubuntu2004

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I7003e95577ab3a9314e8d4d29bb6b1784b9f8ae7
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/48497
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>