Drop support for MySQL #115
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According to Chris Matthews, this had been added exclusively for the (now defunct) lnt.llvm.org instance, which was running on Google's internal infrastructure and hence had constraints on the database software it could use.
Since that is not relevant anymore, simplify the codebase and the support matrix of LNT by dropping support for MySQL. According to Chris, LNT was originally always intended to run on a Postgres database.
This allows us to actually test what we claim to support, making LNT more robust despite its slightly shrunken support matrix. In practice, I expect that nobody will be impacted by this change since nobody is running a MySQL instance.