Bug#820145: Sendmail-bin moves /etc/mail/ssl to /etc/mail/tls even when both directories exist

[Tim Woodall <debianbugs@woodall.me.uk>]

Package: sendmail-base
Version: 8.14.4-4+deb7u1
Severity: minor

I have /etc/mail/tls and also /etc/mail/ssl which contains dhparam.pem.

On upgrading sendmail-base the pre-inst script does:
                # Move files to new home
                if [ -d /etc/mail/ssl ]; then
                        mv -f /etc/mail/ssl /etc/mail/tls;
                        fi;
                ;;

This, then promptly breaks TLS email as sendmail.mc refers tot he
dhparam.pem in the old directory which no longer exists.

This script ought to check if both directories exist and, if so, not
move /etc/mail/ssl/ to /etc/mail/tls/ssl/