Improve postfix element.

Changes 09-* files to 59-* to ensure they run after OCA.
Adds templates for main.cf and mailname to allow configuration of hostname
and delay_wait_time. The current code has the DIB hostname from chroot
at build time in these files preventing local mail delivery.

Fixes bug 1195931
Authored-by: Chris Krelle <nobodycam@gmail.com>
Change-Id: I62badfddac3f6c29f484790c8ebf58f282d597c9
Merge "Improve postfix element."