CV Manager Message Forwarding Display Changes

[drewjj]

This pull request includes the following:

• New endpoint for existing SNMP message forwarding configurations to query the collected configurations directly from PostgreSQL. This improves optimization of the SNMP display. These configurations are collected from the rsu_status_check addon and are updated regularly.
• Webapp changes to support this new endpoint instead of directly performing an SNMPwalk. This prevents the application from trying to automatically reach offline units when clicked on and eliminates varying response times for each RSU as a factor in performance.
• UI changes to correctly place the remove button for NTCIP 1218 message forwarding configurations.

Realistically this is only a portion of the ideal menu for SNMP displays. New SNMP configurations won't display automatically anymore (the rsu_status_checker needs to update PostgreSQL with the information first). This will be updated in the future to also allow the ability to do a manual SNMPwalk. The older web application code to hit the manual SNMPwalk endpoint in the API has been kept to allow for this.