raise only knife-cloud exceptions and not fog exceptions.
abstract list_flavors support in fog service.
Added changes to resolved short option ambiguity
rename cloud exceptions as per review comments.
Merge pull request #54 from ClogenyTechnologies/sid-oc-11210-short-opt-ambiguity

OC-11210 EC2 refactored code has ambiguity in the name of short-option for Gateway & Groups
Implemented review comments to use list_resource_configurations name instead of list_flavors
Merge pull request #53 from ClogenyTechnologies/kd/OC-11204-exceptions

OC-11204 - Exception handling and abstraction