Drive: improve ability to simulate I/O errors in tests

Currently we can simulate a remote error (network / server) when executing an Automation call or downloading a file by calling Controller.make_remote_raise()

We should also be able to:

• Test local device errors such as "IOError: No space left on device".
• Test a remote error during file upload (BaseAutomationClient.upload()).
• Simulate a remote or local error in the middle of an upload (BaseAutomationClient._read_data()) / download (RemoteFileSystemClient._do_get()).
  Currently for download we only raise an IOError once the file is totally downloaded, yet this is OK as the exception is thrown before the .part file is renamed.
• Take into acccount file size in IOError tests, for example to simulate a case where only the large files of a synchronized folder would fail but not the small ones.
• Not have the code testing a simulated error "pollute" the runtime code, but is this possible?