Add hostif trap for NTP

[vivekmoorthy]

Add IANA-reserved port for NTP:
https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=ntp

[mikeberesford]

@kcudnik @rck-innovium @JaiOCP @kperumalbfn Mind reviewing this PR? It's similar to #1436

[JaiOCP]

Looks good to me

[vivekmoorthy]

@rck-innovium Could you help with this review?

[vivekmoorthy]

@kcudnik I see the PR is waiting on "LGTM analysis: Python"
Does this need to be triggered again? Suggestions?

[kcudnik]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[kcudnik]

not sure why this hanged on python, no changes are here made

[kcudnik]

if this retrigger will not help, please add force empty commit to this branch this will retrigger all pipelines

[kcudnik]

i'm not able to retrigger python from github page @vivekmoorthy, please add empty commit here to retrigger

[vivekmoorthy]

Thanks. retriggered and now the checks have passed.

[vivekmoorthy]

@rck-innovium @JaiOCP @kperumalbfn could you provide your approvals again due to retrigger.

[vivekmoorthy]

@kcudnik If approvals look ok, would you be able to help with merging this PR?

[kcudnik]

was this discussed and approved on latest SAI community meeting?

[vivekmoorthy]

was this discussed and approved on latest SAI community meeting?

This PR was discussed 2 weeks back in SAI meeting and the decision was to split the Traps to NTPCLIENT and NTPSERVER.

@lguohan for visibility.