Dev: testcases: Adjust original test cases to match pacemaker-3

[liangxin1300]

Major changes:

• Remove stonith:null and stonith:ssh in original test cases
• Set stonith-enabled=false to avoid config error

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.71%. Comparing base (e63ac0b) to head (e9da0c3).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
crmsh/ui_cib.py	0.00%	1 Missing ⚠️

Additional details and impacted files

Flag	Coverage Δ
integration	53.52% <0.00%> (ø)
unit	53.08% <0.00%> (ø)

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Files with missing lines	Coverage Δ
crmsh/ui_cib.py	30.12% <0.00%> (ø)

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[liangxin1300]

This PR can be merged when pacemaker 3 is available at CI image