Dev: ssh_key: more robust error handling in KeyFileManager (bsc#1239084)

[nicholasyang2022]

add set -e to the shell script so that it exits and reports on errors.

[liangxin1300]

Thanks!
Please backport to crmsh-4.6

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.73%. Comparing base (0f77021) to head (af9f40c).
Report is 5 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
integration	53.60% <100.00%> (-0.01%)	⬇️
unit	53.08% <0.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
crmsh/ssh_key.py	74.44% <100.00%> (ø)

... and 2 files with indirect coverage changes

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