SNMP Monitoring Enhancements

We need two additional features for the SNMP scanning. 1. The ability to scan multiple subnets from one computer. For example (scan the management vlan for networking equipment and scan the staff vlan for things like printers, etc.) 2. We need to be able to do more general network monitoring. For example, add network devices that aren't necessarily SNMP enabled, but still need to be monitored for up/down and latency. 3. Show the ping latency for monitored devices 4. Add a notes field for each device 5. Add the MAC address for the monitored network device interface for each device on the SNMP dashboard 6. Allow us to manually choose/type in a device type