Set apparmor profile in execin

The set of the apparmor profile for the setns codepath was missing.
Selinux was being called but apparmor was forgotten.  This was causing
no profiles to be applied to the extra process spawn inside an existing
container.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #224 from crosbymichael/set-apparmor-execin

Set apparmor profile in execin