Currently we have 2 ways of specifying ECMP

1. Via compilation of FRR
2. Via runtime specification

Let's add a 3rd ability to query the kernel( or relevant api ) for any underlying hardware abstraction

Then after we have this input. Choose the min of the 3 to use at run time

Also add the same thing for # of routes. Some hardware has a limitation on the # of routes that can be installed. Allow the code to smartly understand that.