Support env variables in report manager

[malaskowski]

Description

ReportConfigurationManager reportDomain is not modifiable outside OSGi scope. This is required to configure with Docker cluster managers.

Motivation and Context

Enable setting reportDomain as an environment variable. It will override any OSGi settings if provided.
This feature will be documented in the future in the Docker support section.
The priority of setting this value is:

• OSGi configuration
• env variable REPORT_DOMAIN
• default configuration value

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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