LibreNMS vrf-lite 

Changes made:
* VRF-lite compatible 
* Ipv4 SNMPv3 context compatible (VRF-Lite)
* Ipv6 SNMPv3 context compatible (VRF-Lite) (only DB and discovery/poller, not in the html view)
* Bgp SNMPv3 context compatible  (VRF-Lite)
* OSPF SNMPv3 context  compatible  (VRF-Lite)
* HTML VRF-lite compatible (reference made by ipv4* tables)
* Disocovery route module
* HTML visual changes
* Add some MIBs
* Other global changes