* IDEMPIERE-4866 : Multiple smtp per tenant
Same PR as https://github.com/idempiere/idempiere/pull/783
* IDEMPIERE-4866 : Multiple smtp per tenant - various fixes
Fixes suggested by Carlos on https://github.com/idempiere/idempiere/pull/783 (remove System.out, change AD_Element name, tab in SingleRow mode) + fix NPE
* IDEMPIERE-4866 : Multiple smtp per tenant : implement cache
* IDEMPIERE-4866 : Multiple smtp per tenant : process EMailTest was not set on column
Fixes by Carlos
Co-authored-by: Carlos Ruiz <carg67@gmail.com>