RHINENG-13518: assign only system which are in candlepin

[MichaelMraka]

Secure Coding Practices Checklist GitHub Link

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

Secure Coding 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

[jira-linking]

Referenced Jiras:
https://issues.redhat.com/browse/RHINENG-13518

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 63.43%. Comparing base (1a55ecd) to head (76d0fbb).

Files with missing lines	Patch %	Lines
manager/controllers/template_systems_update.go	56.00%	6 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1512      +/-   ##
==========================================
- Coverage   63.45%   63.43%   -0.02%     
==========================================
  Files         114      114              
  Lines        9637     9651      +14     
==========================================
+ Hits         6115     6122       +7     
- Misses       2980     2985       +5     
- Partials      542      544       +2     

Flag	Coverage Δ
unittests	63.43% <63.33%> (-0.02%)	⬇️

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[psegedy]

/retest