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[Merge] ~chad.smith/cloud-init:cc-ntp-schema into cloud-init:master


The proposal to merge ~chad.smith/cloud-init:cc-ntp-schema into cloud-init:master has been updated.

Commit Message changed to:

cc_ntp: Add schema definition and passive schema validation.

cloud-config files are very flexible and permissive. This branch adds a supported schema definition to cc_ntp so that we can properly inform users of potential misconfiguration in their cloud-config yaml.

This first branch adds a jsonsschema definition to the cc_ntp module and validation functions in cloudinit/config/schema which will log warnings about invalid configuration values in the ntp section.

A cmdline tools/cloudconfig-schema is added which can be used in our dev environments to quickly attempt to exercise the ntp schema. Eventually this cloudconfig-schema tool will evolve into a cmdline tool we can provide to users or a validation service which will allow folks to test their cloud-config files without having to attempt deployment to find errors or inconsistencies.

LP: #1692916

For more details, see:
Your team cloud-init commiters is requested to review the proposed merge of ~chad.smith/cloud-init:cc-ntp-schema into cloud-init:master.