bootz skip ownership check

[xw-g]

Add the support of skipping ownership validation in Bootz.

There are 3 sequentially dependent PRs to introduce this changes.

1. Bootz API PR updates Bootz API and README.
2. [This PR] OC modeling PR updates Bootz OpenConfig modeling.
3. FP test PR updates feature profile tests

module: openconfig-system-bootz

  augment /oc-sys:system:
    +--rw bootz
       +--rw config
       |  +--rw validate-ownership?   boolean <<<<<<<<<<<<<<<<<< new
       +--ro state
          +--ro checksum?              string
          +--ro error-count?           oc-yang:counter64
          +--ro status?                enumeration
          +--ro last-boot-attempt?     oc-types:timeticks64
          +--ro ownership-validated?   boolean <<<<<<<<<<<<<<<<<< new
          +--ro validate-ownership?    boolean <<<<<<<<<<<<<<<<<< new

[OpenConfigBot]

Major YANG version changes in commit 4d00898:

[dplore]

Suggested change

	"This field controls if the device should validate the ownership in
	the next bootz workflow";
	"This field controls if the device should validate the ownership
	voucher as described in the bootz bootstrapping service API
	flow.";

[xw-g]

I denied your suggestions, because we need to call it out that it's for next bootz workflow that runs.

[dplore]

I was attempting to be more precise on two dimensions:

• This leaf refers specifically to the bootz bootstrapping service which is a specific step within the bootz API Flow. (although admittedly, the bootz specification specifies a section header as API Flow but then also uses the words 'workflow' occasionally inside the API Flow section, I guess API Flow and Workflow are the same thing?).

• This setting should be honored for every invocation of the bootstrapping service, not just the 'next' workflow? I guess since the configuration is persistent, the 'next' workflow could be considered all future workflows.

[xw-g]

The parent container is Bootz, so the all the leaves here is about the Bootz spec.

[dplore]

@marcushines @xw-g do you want to continue with this PR? If yes please review