Display on required properties in sample configuration

[mtuchi]

Description

Currently the sample configuration section on docs. Displays all configuration-schema properties regardless if they are required or not. This causes lot's of confusion especially for new users who are using the adaptor for the first time.

The request In few words

• Display only required properties in sample-configuration schema
• Make sure all properties type accurately matches the configuration schema type. For Boolean property it should show a boolean value and not a string value. Eg:Postgresql adaptor . ssl: true not ssl: "true". Of