OAM support for labeled IS-IS flex algo segment routing paths

The following Operation, Administration, and Maintenance (OAM) capabilities for labeled IS-IS Flexible Algorithm (flex algo) segment routing paths:

• IPv4 and IPv6 MPLS ping
• IPv4 and IPv6 MPLS traceroute
• Equal-cost multipath (ECMP) traceroute

To enable these OAM capabilities, we've introduced the algorithm option in the following commands:

• ping mpls segment routing isis fec algorithm algorithm-id
• traceroute mpls segment routing isis fec algorithm algorithm-id