Fixed #2222 (Not being able to have different discriminator values map to the same entity) by switching key and value in map#2249

IgorMaj wants to merge 3 commits intoswagger-api:masterswagger-api/swagger-parser:masterfrom

IgorMaj:bug/fix-2222-ref-handling-in-discriminator-mappings-mapping-to-same-entityIgorMaj/swagger-parser:bug/fix-2222-ref-handling-in-discriminator-mappings-mapping-to-same-entityCopy head branch name to clipboard