LU-12895 tests: add Debian dependency on selinux-utils package

LU-12895 tests: add Debian dependency on selinux-utils package

For Debian, add a dependency on selinux-utils to the lustre-tests
package. This is required in order to have 'getenforce' command
available on client nodes running auster test suite.

Fixes: 4ae1c96672df ("LU-12895 tests: stop running tests for SSK and SELinux")
Test-Parameters: trivial clientdistro=ubuntu1804 testlist=sanity
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ie9d7e8280f9c41c2a4878c9951ef8f07ac36c594
Reviewed-on: https://review.whamcloud.com/36882
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>