Remove automatic configuration of nagios

Drop calls of naginator module classes to configure nagios by default as
the module design does not align with Puppet workflows as used with
stackforge modules, and as most users have preferred NMS solutions which
they use instead of the default example Nagios setup this created.

Change-Id: I51ba18b7c059a07e686ef0f2410d266ef08a37b8
Implements: blueprint nagios-ectomy