@Override
            public int compare(ApiPlanBean o1, ApiPlanBean o2) {
                String p1 = o1.getPlanId() + ":" + o1.getVersion(); //$NON-NLS-1$
                String p2 = o2.getPlanId() + ":" + o2.getVersion(); //$NON-NLS-1$
                return p1.compareTo(p2);
            }
Converts the list of plans to a string for display/comparison.
@param plans the plans
@return the plans as a string
manager/api/rest-impl/src/main/java/io/apiman/manager/api/rest/impl/audit/AuditUtils.java