fix mmh3.hash64 unicode exception with python2

[djova]

What does this PR do?

Fixes mmh3.hash64 UnicodeEncodeError when the query contained non-ascii characters in python2.

datadog_checks/base/utils/db/sql.py:27: in compute_sql_signature
    return format(mmh3.hash64(normalized_query, signed=False)[0], 'x')
E   UnicodeEncodeError: 'ascii' codec can't encode character u'\xd2' in position 15: ordinal not in range(128)

Motivation

Fix bug originally surfaced while working on #10637

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #10685 (3d0f82e) into master (7ec881f) will increase coverage by 0.03%.
The diff coverage is 100.00%.

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[yzhan289]

Thanks for the PR, is it possible to add a test case to ensure this works?

[djova]

Thanks for the PR, is it possible to add a test case to ensure this works?

Yes, I just added a test case with a unicode character.