[RHCLOUD-37601] Store lower case username for principal

[astrozzc]

Link(s) to Jira

• https://issues.redhat.com/browse/RHCLOUD-37601

Description of Intent of Change(s)

The what, why and how.

Local Testing

How can the feature be exercised?
How can the bug be exploited and fix confirmed?
Is any special local setup required?

Checklist

• if API spec changes are required, is the spec updated?
• are there any pre/post merge actions required? if so, document here.
• are theses changes covered by unit tests?
• if warranted, are documentation changes accounted for?
• does this require migration changes?
  • if yes, are they backwards compatible?
• is there known, direct impact to dependent teams/components?
  • if yes, how will this be handled?

Secure Coding Practices Checklist Link

• https://github.com/RedHatInsights/secure-coding-checklist

Secure Coding Practices Checklist

• Input Validation
• Output Encoding
• Authentication and Password Management
• Session Management
• Access Control
• Cryptographic Practices
• Error Handling and Logging
• Data Protection
• Communication Security
• System Configuration
• Database Security
• File Management
• Memory Management
• General Coding Practices

[lpichler]

/retest