[web-2016-06-01] Connections - All ParameterValues attributes should be `*map[string]interface{}`

[mbfrahry]

We're running into an issue with the sdk for azurerm_api_connection

json: cannot unmarshal bool into Go struct field ApiConnectionDefinitionProperties.properties.nonSecretParameterValues of type string

CustomParameterValues, NonSecretParameterValues, and ParameterValues are currently *map[string]string but I believe they should be *map[string]interface{}