tests: put DescriptorParserTests in Plugin Tests collection (real fix for master 404) - #15

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The type name 'pbr' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'pbc' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'pb' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'grpc' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'scg' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'pbr' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'pbc' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'pb' only contains lower-cased ascii characters. Such names may become reserved for the language.

'DerivationSchemeParser.ParseOutputDescriptor(string)' is obsolete: 'Use ParseOD instead'