ACR Task run fails through extension

[ehotinger]

1. Right click, run task file on a valid task file.
2. Choose a valid subscription and registry
3. Error

Setting up temp file with 'sourceArchive249914.tar.gz'
   Sending source code to temp file
   Getting build source upload URL 
   Getting blob info from upload URL 
   Creating blob service 
   Creating block blob 
Uploaded source code to /sourceArchive249914.tar.gz
Set up run request
Error: The provided source location 'source/201812050000/107924a9-1268-4ea7-b4b8-4c9ca7da7e5b.tar.gz' is invalid or doesn't exists. Please use 'GetBuildSourceUploadUrl' to get a valid location to upload the source.

[ehotinger]

Maybe this is fixed by #656 - build has identical behavior. Not sure.

[StephenWeatherford]

@rosanch Rodrigo, can you verify this is fixed by #656? Thx.

[rosanch]

I still have to test it on Linux. However, I did add changes to fix this in #656
The problem was in how the path was being handled

[rosanch]

This PR will be close because is the same issue in #666. Please follow that issue for more info.