Merge branch 'release-0.8.1' of github.com:WindowsAzure/azure-sdk-tools into release-0.8.1
update changelog for 0.8.1
update the date
Merge pull request #2498 from guangyang/release-0.8.1

update changelog and readme
Initial port
Port TAB completion feature over
register resoyrce provider for caching
Merge pull request #2512 from yugangw-msft/portcache

Port managed cache commands over
Update ChangeLog.txt
Merge pull request #2524 from Azure/release-0.8.1

Release 0.8.1
Upgraded ResourceManager and Microsoft.IdentityModel.Clients.ActiveDirectory packages to latest
Changed Subscription.json to point to production Sandbox
Added support for interactive mode AD in mocks
Re-recorded tests
Replaced HttpRecorder with nuget package (1573860)
Updated TrafficManager tests and replaced references to the old HttpServer namespace
Updating ATM help
Merge pull request #2536 from ogail/atm-help

Updating ATM help
Fix:
Set-AzureVMImageOSDiskConfig -HostCaching not populating the input value;
Save-AzureVMImage's check on same image name in the other type.
get rid of environment variable set up when run PS scenaerio test under mock