Re-implement fetch-cve option for oscapd

[baude]

* Based on the agreement with Martin and DWalsh, we now
  have an option for oscapd as to whether to fetch the most
  recent cve input data.

* The singleton class previously used had to be refactored
  because of the daemonization and the need to change options
  each 'scan'.  Instead of using the singleton implementation,
  we now pass the applicationConfiguration class to other
  classes as an object.

* Made small correction to convert the byte onlycache to an
  int for equality checking.

[mpreisler]

I really like that you removed the singleton, I wanted to do that but was postponing it.

Thanks!