BGP (IMISH) Stats, Neighbors, and Details

[allebone]

In order to continuously monitor routing based changes which can be caused/inflicted by outside entities, it would be imperative to be able to use Grafana (and by extension Alertmanager) to monitor the salient BGP detail, which are normally provided by IMISH on CLI.

Examples of useful info:

-BGP State
-Received Messages
-Sent Messages
-BGP Table Version
-Neighbor Table Version
-Accepted Prefixes
-Announced Prefixes