generic/*: add a check for security attrs

generic/*: add a check for security attrs

There are several generic tests that require "setcap", but don't check
whether the underlying fs supports security attrs. Add the appropriate
checks.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>