Interaction between nested key and default

[SparkeyG]

When you have a nested key and also have a default value, you will always get the default value.

For the given test:

    def test_get_yaml_nested_default():
        g = gestalt.Gestalt()
        g.add_config_path("./tests/testdata")
        g.build_config()
        testval = g.get_string("deep_yaml.nest1.nest2.foo", 'default')
        assert testval == "hello"

the test will fail:

===================================================== FAILURES ======================================================
___________________________________________ test_get_yaml_nested_default ____________________________________________

    def test_get_yaml_nested_default():
        g = gestalt.Gestalt()
        g.add_config_path("./tests/testdata")
        g.build_config()
        testval = g.get_string("deep_yaml.nest1.nest2.foo", 'default')
>       assert testval == "hello"
E       AssertionError: assert 'default' == 'hello'
E         - hello
E         + default

tests/test_gestalt.py:249: AssertionError