With the addition of this patch two new defines will be added; one to
manage APT configuration files (apt::conf) and one that abstracts out the
requirements needed to turn on backport repositories (apt::backports).
In addition, the patch takes the opportunity to clean up variable
definitions so they follow a consistent pattern of setting local
variables to the fully qualified value stored in the apt::params
class. Previously all variable used within a class directly addressed
the apt::params namespace when ever the variable was used. In the
pattern they now adhere to we can more easily switch the namespace
data lives in or externalize it even more using hiera.
The hash passing to the with method is cleaner and closer to puppet code, so
all of the with_$param have been replaced with with($hash). This also
includes two minor whitspace changes to unstable.pp and source.pp.
This also replaces the ternary switch on param_set with a hash merge,
which is cleaner and will support more use cases.
