Updated default image name in Azure driver

Updated default image name in Azure driver

Signed-off-by: Ruslan Gabitov <ruslan.gabitov@live.com>
Added "error" state for Azure host

Added "error" state for Azure host

Signed-off-by: Ruslan Gabitov <ruslan.gabitov@live.com>
Merge pull request #17 from MSOpenTech/host-management

Added "error" state for Azure host