[COOK-3365] Update leap seconds file to version 3597177600
Merge pull request #26 from juliandunn/COOK-3365

[COOK-3365] Update leap seconds file to version 3597177600
Merge branch 'upstream' into jenkins-upstream-10
Merge pull request #3 from rackspace-cookbooks/jenkins-upstream-10

merges from ntp - upstream