[RFE] Add report-ready & report-failure flag to Azure-init CLI

# Current situation
Azure-init is aiming to improve its modularity by adding flags for each feature. Currently, there is no mechanism to signal when a report is ready or when a failure occurs.

# Ideal future situation
We are able to call one of the below flags to have azure-init indicate provisioning status.

# Implementation options
- `azure-init --report-ready`
- `azure-init --report-failure`
- `azure-init --report-in-progress` (tbd on this one)

# Additional information

These flags should not be exclusive. We want the ability to combine them with other flags in a single call to azure-init (e.g., `--report_ready --configure-sshd`).