Update requirements.txt
Update requirements.txt

The RC2 version needs msrest/msrestazure 0.2.x, not further
Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,AutorestCI/azure-sdk-for-python,v-iam/azure-sdk-for-python,SUSE/azure-sdk-for-python,lmazuel/azure-sdk-for-python,Azure/azure-sdk-for-python,rjschwei/azure-sdk-for-python,Azure/azure-sdk-for-python