Bringing conformance to the Disk version used in root tags. (#3939)
Bringing conformance to the Disk version used in root tags. (#3939)

@dashult discovered the discrepancy between the tags `package-2018-06`
and `package-2018-06-exclude-gallery`. The difference is causing the
modeler to choke on duplicate type definitions for the TypeScript and
Node.js generators.
henry416/azure-rest-api-specs,yugangw-msft/azure-rest-api-specs,Nking92/azure-rest-api-specs,naveedaz/azure-rest-api-specs,vladrai/azure-rest-api-specs,Nking92/azure-rest-api-specs,yaakoviyun/azure-rest-api-specs,brjohnstmsft/azure-rest-api-specs,Nking92/azure-rest-api-specs,amarzavery/azure-rest-api-specs,hyonholee/azure-rest-api-specs,yaakoviyun/azure-rest-api-specs,AppPlatPerf/azure-rest-api-specs,AsrOneSdk/azure-rest-api-specs,hovsepm/azure-rest-api-specs,henry416/azure-rest-api-specs,JasonYang-MSFT/azure-rest-api-specs,solankisamir/azure-rest-api-specs,deathly809/azure-rest-api-specs,hovsepm/azure-rest-api-specs,AuxMon/azure-rest-api-specs,johanste/azure-rest-api-specs,naveedaz/azure-rest-api-specs,brjohnstmsft/azure-rest-api-specs,AppPlatPerf/azure-rest-api-specs,amarzavery/azure-rest-api-specs,AsrOneSdk/azure-rest-api-specs,yugangw-msft/azure-rest-api-specs,vladrai/azure-rest-api-specs,johanste/azure-rest-api-specs,deathly809/azure-rest-api-specs,solankisamir/azure-rest-api-specs,hyonholee/azure-rest-api-specs,AuxMon/azure-rest-api-specs