Provider better feedback if one required config is not found

[tmiotto]

Scenario/Intent

#292 stated an weird error that was caused by the Image Streamer IP missing.

The module need to provide better error-handling for these config parameters.

Environment Details

N/A

Steps to Reproduce

Remove any required param from the configuration

Expected Result

OneView Ansible module should raise an significative error saying the specific param was missing.

Actual Result

For at least the image_streamer_ip it fails while connecting to the host leaving the user clueless about what happened.

[VenkateshRavula]

This should be fixed in python SDK. So closing this issue and opened new issue in python SDK.
HewlettPackard/oneview-python#67