1. Re-importing a subscription when initializing each test to avoid subscription interference.

2. Fix SAS Uri tests.
 - Removing subscriptions before uploading with SAS URI.
 - Re-Importing a subscription after uploading.
 - Use https instead of http
 - Create a storage container for SAS Uri testing.

3. Update AzureVM test for more coverage of Hi-MEM test

4. Remove certificate files and Create a certificate during test.

5. Fix RemoveAzureSubscriptions method
1. Fix the method for getting a default location
Fix SAS Uri test to use https instead of http
Merge branch 'dev' of https://github.com/AzureRT/azure-sdk-tools into dev
Add tests for Remote desktop extension cmdlets and diagnostic cmdlets.
Merge pull request #11 from hyonholee/dev

Dev