Enhanced IS-IS sensor support for Junos Telemetry Interface (JTI)

OpenConfig Version v0.3.3 (from v0.2.1) for resource paths related to IS-IS link-state database (LSDB) streaming. The difference between the two versions results in changes, additions, deletions, or non-support for leaf devices related to the following IS-IS type length value (TLV) parameters and IS-IS areas: 

•  TLV 135: extended-ipv4-reachability 
•  TLV 236: ipv6-reachability 
•  TLV 22: extended-is-reachability 
•  TLV 242: router-capabilities 
•  IS-IS interface attributes 
•  IS-IS adjacency attributes 

To provision the sensor to export data through gRPC streaming, use the telemetry Subscribe RPC to specify telemetry parameters. Streaming telemetry data through gRPC also requires the OpenConfig and Network Agent packages, both of which are bundled into the Junos image in a default package named junos-openconfig.