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Summary
Enable registration of session handlers for use with USP SSO authentication plugin. A single function is added, called reregister().
Motivation
This change is needed for the plugin development described in this card: https://sdx-sdsc.atlassian.net/browse/USP-54
Testing
This code was used on a development instance where the plugin was written. Both proof of concept and acceptance testing were performed on the instance: HUBzero developers and USP staff verified that the USP SSO plugin functions properly.
Hotfix
This hotfix should be included on the USP production instance in order to make rollout of SSO possible there. See https://sdx-sdsc.atlassian.net/browse/USP-69
PR checklist
[x] Make sure there are links in the PR to the source JIRA card(s) and hubzero ticket(s)
[x] Include a brief summary of the issue in your own words
[x] Include a brief summary of the fix/changed code
[x] Include a brief summary of your testing. What did you specifically do to investigate that this change has the correct results?
[x] Indicate if the change needs to be hotfixed to any production hubs before a normal core rollout
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