Make this dependency explicit.

These classes all need to inherit from each other or the include
methods we use don't work properly.  Recreate the inheritance
structure and use overrides to change the resolv.conf parameters.

Also fix a few coding style issues.

In addition to adding the anycast DNS servers the individual
resolv.conf files are replaced with a single template.  The existing
class interfaces are preserved and they all create the appropriate
resolv.conf file by invoking the define that handles the small number
of resolv.conf variants.

This is the (old) master branch along with the fixes to the
cron file permissions that Russ made.