semodule: Fix some incorrect impots

sshd_net_t does not exist on el6, thus only include it optionally.

Change-Id: I7557545f8678fe238f72754bffe0b10b95bf3404
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
semodule: Fix some types (not) availabel on el6

Change-Id: I3139ddc6e5176d2ab7a8c6e9056a1a876faeae66
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>