+++ This bug was initially created as a clone of Bug #454775 +++

This addresses the current feature that allows partners to enter a case on
behalf of a customer. This is currently made available via a legacy entitlement
called Partner Case Management.

Rather than permission them individually via legacy entitlements, suggested
solution is to move this to group level permissions in I-T db.
Allow a group to be designated as a "Partner" via the I-T UI, and then associate
them to customer groups by adding those Customers to that Group.
Allow logins to be created for the Partner employees that would allow the
Partner to login to the CSP and open a case on behalf of the customer.
Allow logins for the Partner employees to view and update cases inside of Issue
Tracker UI.
Add tiers to comment permissions so that instead of public/private we have
customer visible/partner&customer visible/partner & RH visible/RH only
Any case created by the customer via their own login would be visible to the
partner.
Cases created by the partner on their own but not on behalf of a customer should
not be visible to the customer(s).
Partner logins should be able to subscribe to events for any customer case.

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Moved from Jira (JBNET-2391)