Update health status of az and collectd mapper

[PradeepKiruvale]

Proposed changes

Code changes include updating the status of the az and collectd mapper.

When mapper starts it publishes up status
and down status when it stops.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[didier-wenzek]

Why a DEFAULT prefix? There is no way to change this name.

Suggested change

	const DEFAULT_COLLECTD_MAPPER: &str = "tedge-mapper-collectd";
	const COLLECTD_MAPPER_NAME: &str = "tedge-mapper-collectd";

[PradeepKiruvale]

fixed

[didier-wenzek]

Approved.