Fix race condition in UniqueId::uniqueId() #1786
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There exists a race condition in UniqueId::uniqueId(). I called msc_init() simultaneously in many threads, so they can have their own instance of ModSecurity. However, the process get core dumped every once in a while. The stack looks like this:
This PR uses std::once_flag to make sure UniqueId::getInstance().fillUniqueId() only called once.