Clarify ReportStatus usage for modular devices

[gmacf]

This PR updates the Bootz readme to clarify the expected behavior for reporting status on modular devices. It makes it clear that devices should report both control cards as initialized for Bootz to complete.

[coveralls]

Pull Request Test Coverage Report for Build 20999685087

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 18.768%

---

Totals
Change from base Build 20977771903:	0.0%
Covered Lines:	640
Relevant Lines:	3410

---

💛 - Coveralls

[dplore]

Suggested change

	- In a modular chassis, the device MUST populate `states` with
	`CONTROL_CARD_STATUS_INITIALIZED` for two control cards. For example,
	a `BOOTSTRAP_STATUS_SUCCESS` report for a modular chassis with one
	state set to `CONTROL_CARD_STATUS_INITIALIZED` and one state set to
	`CONTROL_CARD_STATUS_NOT_INITIALIZED` will be ignored by bootz-server.
	- In a modular chassis, the device MUST populate `states` with
	`CONTROL_CARD_STATUS_INITIALIZED` for each `CONTROLLER_CARD` present in the chassis.
	For example, a `BOOTSTRAP_STATUS_SUCCESS` report from a modular chassis containing two
	`CONTROLLER_CARD` components must not set one `CONTROLLER_CARD`
	stat to `CONTROL_CARD_STATUS_INITIALIZED` and the second `CONTROLLER_CARD` state to
	`CONTROL_CARD_STATUS_NOT_INITIALIZED`. Such a status will be treated as invalid by a bootz-server.

[dplore]

suggested this because it's possible that a modular chassis could contain only one CONTROLLER_CARD component.