further refined the dynamic inventory script for multiple configs
Add check to see if a user config was loaded.

Explicitly exit if no user config is laaded.
Avoids confusing "MD5" hash of "None" error message.
Merge pull request #2 from andymcc/cloundnull-inv

Add check to see if a user config was loaded.
Merge pull request #331 from cloudnull/dynamic-inventory-confd

Dynamic inventory script updates