OCPBUGS-39174: [release-4.15] add leap event handling

[vitus133]

this commit adds leap event handling that includes following:

1. Determine that current time is within -12h...1m from the leap
2. Send PMC command (once) to indicate leap61 or leap 59 to the downstream architecture and
3. Handle ts2phc time ambiguity

This is a manual cherry-pick of https://github.com/openshift/linuxptp-daemon/pull/326, https://github.com/openshift/linuxptp-daemon/pull/342 and https://github.com/openshift/linuxptp-daemon/pull/358

/cc @aneeshkp @jzding @josephdrichard @nishant-parekh

[openshift-ci-robot]

@vitus133: This pull request references Jira Issue OCPBUGS-39174, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required"
• expected dependent Jira Issue OCPBUGS-39173 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is POST instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to [this](https://github.com/openshift/linuxptp-daemon/pull/355): >this commit adds leap event handling that includes following: >1. Determine that current time is within -12h...1m from the leap >2. Send PMC command (once) to indicate leap61 or leap 59 to the downstream architecture and >3. Handle ts2phc time ambiguity Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Flinuxptp-daemon). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vitus133

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[openshift-ci[bot]]

@vitus133: all tests passed!

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[openshift-ci-robot]

@vitus133: This pull request references Jira Issue OCPBUGS-39174, which is invalid:

• expected dependent Jira Issue OCPBUGS-39173 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is POST instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

In response to [this](https://github.com/openshift/linuxptp-daemon/pull/355): >this commit adds leap event handling that includes following: >1. Determine that current time is within -12h...1m from the leap >2. Send PMC command (once) to indicate leap61 or leap 59 to the downstream architecture and >3. Handle ts2phc time ambiguity > >This is a manual cherry-pick of https://github.com/openshift/linuxptp-daemon/pull/326, https://github.com/openshift/linuxptp-daemon/pull/342 and https://github.com/openshift/linuxptp-daemon/pull/358 > >/cc @aneeshkp @jzding @josephdrichard @nishant-parekh Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Flinuxptp-daemon). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.