Add skip-tags functionality

[pcarney8]

This wouldn't change the structure of the openshift_cluster_content.

But would allow for being able to skip over certain sections that we didn't want to be applied using the existing tags functionality

envisioning something very similar to what ansible already does, but passed as an extra var -e skip_tags=jenkins-persistent,nexus

name of the variable might be confusing with native ansible --skip-tags so maybe something like applier_skip_tags might be better