rspec-puppet matchers are defined for tests which exist in
spec/functions, but the function unit tests lived in
spec/unit/puppet/parser/functions. This moves them to the correct place
for using rspec-puppet
As stated on the issue #16498, it would be great to have unit tests
for all the functions.
Function loadyaml was missing a unit test. This commit added the
unit test to loadyaml function.