LU-14199 sec: find policy version in use for sepol

LU-14199 sec: find policy version in use for sepol

SELinux exports the maximum kernel policy version that can be used.
When building SELinux status checking representation 'sepol', we need
to look for all possible versions of the policy, not only the max one.

Test-Parameters: clientdistro=el8.3 serverdistro=el8.2 testgroup=review-dne-selinux
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Iae4b66403ce953e5a7c0df585900713c597ff033
Reviewed-on: https://review.whamcloud.com/40918
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>