Bug#457708: eliminate startup warnings

[jidanni@jidanni.org]

Package: apache2
Version: 2.2.6-3
Severity: minor

Instead of the user having to search Google for ways to fix
# apache2ctl start
 apache2: Could not reliably determine the server's fully qualified
 domain name, using 127.0.0.1 for ServerName
Could we instead have a configuration item
[ ]use ___________
[ ]use 'localhost'
[ ]use contents of today's /etc/hostname
[ ]use contents of /etc/hostname as found upon each start
OK, but maybe those aren't fully qualified domain names.
Anyway, this message should at least be addressed in the Debian docs
without the user needing to search the Internet for a solution.