Change Environment Variable definition

[tharindu1st]

Description:
In order to define an environment variable for name config value under complexBean, we have to defind environment variable as follows.

WSO2.CONFIGURATION_COMPLEXTESTBEAN_NAME="default"

As OS its not support to keep (.) mark in the environment variable due to that we had convert it to( _ ) in the namespace.

current configuration as follows

WSO2_CONFIGURATION_COMPLEXTESTBEAN_NAME="default"

wso2.configuration:
  complexBean:
    name: default
    Bean:
      name: default