Fully qualify path to boolean_value util as Pkg::Util

There are bound to be a few of these comming up. Everywhere a util was migrated
to Pkg::Util, we need to fully qualify it where used.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #263 from MosesMendoza/maint/master/fix_boolean

Fully qualify path to boolean_value util as Pkg::Util