Move lmnet/lmnet/utils utils to blueoil/utils

[iizukak]

This PR is a part of #796
I moved lmnet/lmnet/utils to blueoil/utils

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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[iizukak]

@odoku @tfujiwar @suttang Please re-review this PR 🙇 🙇 🙇

[odoku]

LGTM!!!

[tsawada]

Readability Approval

[iizukak]

/ready

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