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LIR: merge hash attributes of same name to support legacy configurations
A [build failure][] of the grok plugin when run through LIR/lscl indicates that there is an expectation for multiple Attributes of the same name to be merged together. This commit ports the failing spec in the plugin to an abstraction that can be tested within logstash-core, and adds a caveat to the LSCL LIR-builder to ensure that we merge the hashes in a way that is compatible with legacy behaviour. NOTE: when multiple Attributes of the same name are used in a single config, it's possible to create configurations that circumvent `AST::Hash`'s ability to report duplicate keys. [build failure]: https://travis-ci.org/logstash-plugins/logstash-filter-grok/builds/293778268
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