Revert "Fix loganalyzer.py UnicodeDecodeError issue"

[ZhaohuiS]

Reverts #6524
Non utf-8 characters are not expected in syslog, we should not ignore this kind of errors.
Revert this PR to make sure we can catch this issue in nightly test in future.

[azure-pipelines]

The pre-commit check detected issues in the files touched by this pull request.
The detected issues may be old or new. For new issues, please try to fix them.

For old issues, it is not mandatory to fix them because they were not caused by this change. It is unfair to blame
author of this pull request. But if you can take extra effort to fix the old issues as well, that would be great!

Detailed pre-commit check results:
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check for added large files..............................................Passed
check python ast.........................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

ansible/library/extract_log.py:76:1: E402 module level import not at top of file
ansible/library/extract_log.py:77:1: E402 module level import not at top of file
ansible/library/extract_log.py:78:1: E402 module level import not at top of file
ansible/library/extract_log.py:79:1: E402 module level import not at top of file
ansible/library/extract_log.py:80:1: E402 module level import not at top of file
ansible/library/extract_log.py:81:1: E402 module level import not at top of file
ansible/library/extract_log.py:82:1: E402 module level import not at top of file
ansible/library/extract_log.py:83:1: E402 module level import not at top of file
ansible/library/extract_log.py:84:1: E402 module level import not at top of file
ansible/library/extract_log.py:85:1: E402 module level import not at top of file
ansible/library/extract_log.py:86:1: F403 'from ansible.module_utils.basic import *' used; unable to detect undefined names
...
[truncated extra lines, please run pre-commit locally to view full check results]

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