Create image stream and application templates for RH-SSO 7.3.0 GA image

Repurposing this Jira for RH-SSO GA Image stream. If anything is needed for GA, please track it in this Jira.

Create image stream and application templates for RH-SSO CD TP image stream. At the beginning the image stream and templates will be based on RH-SSO 7.3 TP image.