new function axis2_svc_client_get_conf_ctx() needed.

It is desired to have above function for the service client api to retrieve the configuration context. In some instances after first service client is created we should be able to retrieve the configuration context from that service client and create new service cients passing that configuraiton context using axis2_svc_client_create_with_conf_ctx_and_svc() function.
This is very useful since creating configuration context is very expensive task since this reads all configuration files again and again.