Adding control over sending of IS-IS CSNP packets on P2P interfaces

[adamsimpson1]

Adding a single new leaf to control (optionally disable) the periodic transmission of CSNP PDUs on point-to-point interfaces

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[OpenConfigBot]

Compatibility Report for commit 06589649ee86a9e429c158b8a12fcde263d22307: ⛔ yanglint@SO 1.10.17

[dplore]

Thanks for the contribution, before we can review and merge, please do take care of the CLA and we can proceed.