Added support for forwarding Secure Group Tags (SGT) on traffic. This is available on Z3(C), MX64(W), MX65(W), MX67(C,W), and MX68(W,CW), MX75, MX84*, MX85, MX95, MX100, MX105, MX250, and MX450 appliances and enables full stack (MR+MS+MX) Adaptive Policy operation. * Please see the known issues for important information about SGT on MX84 appliances.
