implement generator package version check
implement generator package version check

check for generator package's version and upgrade if not latest.

begoldsm/azure-sdk-for-node,begoldsm/azure-sdk-for-node,Azure/azure-sdk-for-node,AuxMon/azure-sdk-for-node,lmazuel/azure-sdk-for-node,xingwu1/azure-sdk-for-node,xingwu1/azure-sdk-for-node,AutorestCI/azure-sdk-for-node,AuxMon/azure-sdk-for-node,AutorestCI/azure-sdk-for-node,lmazuel/azure-sdk-for-node,amarzavery/azure-sdk-for-node,xingwu1/azure-sdk-for-node,Azure/azure-sdk-for-node,Azure/azure-sdk-for-node,amarzavery/azure-sdk-for-node