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Make AllowedMethodsFilter immutable (#1967)

* Make AllowedMethodsFilter immutable

It looks like that the set of allowed methods in AllowedMethodsFilter is
not modified after it was created. We could embrace it and make immutable
during the creation time. This also should provide some performance
benefits, because immutable hash tables could be optimized during
construction times (e.g. they can use linear probing instead chaining)

* Close the database pool after completion of the tests

Otherwise different tests could use the same database if they are relatively
quick to execute.

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