Switch default emulator mode to Full to mitigate the risk for the PS release next week. We might consider to switch it back after
fix an error that removing the iis express option
Add unit test for the previous regression of deleting the "/useiisexpress" by mistake
Merge pull request #2331 from yugangw-msft/DefaultToFullEmulator

Switch default emulator mode to Full to mitigate the risk for the PS rel...