fix docker ip range

postfix config should consider all docker networks local. In fact, if no custom config is supplied the network is correctly set with a larger network mask to account for additional docker networks  but in the setup_conf_and_secret function the network uses /16 mask

Updated glibc vulnerability for Centos
Updated maintainer info
refs #31339

refs #31595: add Chaperone, use Centos 7, remove example folder

refs #28587 Configure for generic usage of postfix, not only as relay; use centos6 to start postfix service

This will work for applications invoking /usr/bin/sendmail

It will not work for applications connecting directly to localhost:25.

Add a separate folder for eionet specific config.