specs: move function specs to where rspec-puppet expects them

diff --git a/spec/unit/puppet/parser/functions/basename_spec.rb b/spec/functions/basename_spec.rb
similarity index 100%
rename from spec/unit/puppet/parser/functions/basename_spec.rb
rename to spec/functions/basename_spec.rb

diff --git a/spec/unit/puppet/parser/functions/bool2str_spec.rb b/spec/functions/bool2str_spec.rb
similarity index 100%
rename from spec/unit/puppet/parser/functions/bool2str_spec.rb
rename to spec/functions/bool2str_spec.rb

diff --git a/spec/unit/puppet/parser/functions/camelcase_spec.rb b/spec/functions/camelcase_spec.rb
similarity index 100%
rename from spec/unit/puppet/parser/functions/camelcase_spec.rb
rename to spec/functions/camelcase_spec.rb

diff --git a/spec/unit/puppet/functions/type_of_spec.rb b/spec/functions/type_of_spec.rb
similarity index 100%
rename from spec/unit/puppet/functions/type_of_spec.rb
rename to spec/functions/type_of_spec.rb