rootns: kselftest

Add a rootns test suite to tools/testing/selftests/rootns.

Cover rootns creation, lifecycle, root mount setup and entry policy.

Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
3 files changed