Merge branch 'dev' of https://github.com/huangpf/azure-sdk-tools into dev
Test: tests for Add AzureServiceExtension cmdlets.
Test Fixes: A8 and A9 sizes are not available for IaaS VM.
Merge pull request #80 from huangpf/dev

Extensions for Sprint 29
Merge branch 'dev' of https://github.com/hyonholee/azure-sdk-tools-1 into dev