fix: Move system_scope check to the keystone_client

[enolfc]

Description

The extractor is trying to use project and system scopes at the same time resulting
in a Keystone Authentication error:

Authentication cannot be scoped to multiple targets. Pick one of: project, domain, trust, system or unscoped

Fixes #143

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Tested with a fedcloud production OpenStack with an accounting account created as documented

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud