Support running tests against Puppet Enterprise

This removes FOSS specific pathing in the ntp_parameters_specs and
removes the basic_spec entirely (both contained FOSS specific paths but
the basic test seemed more like a sanity check on the testing tools)
Merge pull request #125 from justinstoller/maint/3.0.x/dont_assume_foss

Support running tests against Puppet Enterprise
Workaround for stdlib 3.2 in PE3.x.

Switch from dirname() to an inline_template that calls File.dirname
directly.
Merge pull request #126 from apenney/stdlib

Workaround for stdlib 3.2 in PE3.x.
Add PE support.
Merge branch '3.0.x' of https://github.com/puppetlabs/puppetlabs-ntp into 3.0.x
Rework the requestkey's test to pass on SLES.
Merge branch '3.0.x'