Replace max hop count and total hop count with remaining hop count?

[mickeyspiegel]

By replacing max hop count and total hop count with remaining hop count, we can save one byte in the INT header.

• Source sets initial value of remaining hop count
• Every hop that adds INT metadata decrements the remaining hop count by 1
• When remaining hop count reaches 0, the INT metadata stack is full and the E bit must be set to 1

A device parsing the INT metadata stack uses the length from the appropriate INT shim header to determine when it reaches the end of the INT metadata stack:

• metadata stack size = 'length' * 4 - [total fixed header sizes]

[mhira1]

This is addressed by Mickey's commit 19295e5