OEL 7 missing from os_dict

[mattmaniflaf]

Oz wiki at : https://github.com/clalancette/oz/wiki
Indicates that OEL 7.x is a supported distro. Just tried 0.16.0 and OEL-7 is failing, due to no definition for the distribution available in GuestFactory.py : os_dict.

I added a line :
'OEL-7': 'RHEL_7',

And it appears to attempt to install from the provided OEL 7.5 provided ISO. Not sure if anything else is required other than this.