private List<ApplicationId> listApplicationIds(TenantName tenantName) {
        Utils.checkThatTenantExists(tenantRepository, tenantName);
        Tenant tenant = tenantRepository.getTenant(tenantName);
        TenantApplications applicationRepo = tenant.getApplicationRepo();
        return applicationRepo.activeApplications();
    }
Handler for listing currently active applications for a tenant.

@author Ulf Lilleengen
configserver/src/main/java/com/yahoo/vespa/config/server/http/v2/ListApplicationsHandler.java