Fix data races found by thread sanitizer

[malirod]

Single LogFromFreeFunctionFromAnonymousNamespace test produced 116 warnings.
Most of them (maybe all) are related to attributes management (data races). If used SYNC logger, then no issues at all.
To reduce amount of warnings try to do the following
in LogFromFreeFunctionFromAnonymousNamespace

• leave only two log lines
• remove all attributes from logging (name, line, file, severity)
• leave only severity filter

Doing this the amount of data races is 11.

[malirod]

Log of thread san output:
data-races.txt

[malirod]

Branch minimal-boost-log-sample-with-data-races contains this minimal example