There are some elements that are still using the old os-config-applier to store the configuration templates. Change-Id: I17def1e5e0ca09d5f400d7ba1f7bd82ea804ab42
Install postfix from packages.
Currently this element is valid only for Debian and Debian derived systems.
Sets default install type to local-only so we dont spam anyone. This can be overwritten with the DIB_POSTFIX_INSTALL_TYPE environmental variable.
Valid options for DIB_POSTFIX_INSTALL_TYPE are: Local only Internet Site Internet with smarthost Satellite system
Set postfix hostname and domain via heat: postfix: mailhostname: mail maildomain: example.com delay_warning_time: 4h relayhost: smtp.example.com
*NOTE: mailhostname and maildomain must match the system hostname in order to ensure local mail delivery will work.