Correct Fact mysqld_version on FreeBSD

[kapouik]

trafficstars

Summary

Actually, the fact mysqld_version don't work on FreeBSD.

Additional Context

FreeBSD install package in /usr/local. So mysqld is in /usr/local/libexec and the fact only look in /usr/libexec and PATH.

Checklist

• [ NA ] 🟢 Spec tests.
• [ NA ] 🟢 Acceptance tests.
• [ Validate on FreeBSD ] Manually verified. (For example puppet apply)

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